Jaci

/JH-AA-K-IH/

Unisex Christian Portuguese origin BrazilianIndigenous

Moon (Tupi-Guarani) — Jaci (Tupi-Guarani, from yacy 'moon') is the moon-goddess of Tupi-Guarani mythology, beloved of the sun-god Guaraci. Their nightly meeting in the sky's brief twilight produces the stars (caraca). A unisex Tupi name evoking lunar mythology and indigenous Brazilian cosmology.

See Jaci scored for your family

Quick — what every parent wants to know about Jaci:

🎨 What would baby Jaci look like? 🔢 What's its numerology? 🔊 Does it go with your names? 👶 Is Jaci right for your baby?

Yes — Jaci is a Christian unisex name of Portuguese origin, meaning “Moon (Tupi-Guarani) — Jaci (Tupi-Guarani, from yacy 'moon') is the moon-goddess of Tupi-Guarani mythology, beloved of the sun-god Guaraci. Their nightly meeting in the sky's brief twilight produces the stars (caraca). A unisex Tupi name evoking lunar mythology and indigenous Brazilian cosmology.”.

The one thing this page can't tell you

How well does Jaci fit your family?

This page tells you what Jaci means. The app tells you whether it's right for your baby — scored against the names already in your family, your heritage, and your baby's exact birth star.

Unlock Jaci's score — free
NameRoot scoring a name across six signals — phonetics, numerology, birth star, culture, meaning and uniqueness

Six signals — scored for your family, not in the abstract:

🌟
Birth starAuspicious for your baby?
🔢
NumerologyDestiny 5, matched to you
🔊
PhoneticsGoes with your names?
💗
MeaningThe Light cluster
🛕
HeritageChristian + family-tree fit
✨
UniquenessFamiliar vs rare

Meaning & origin

Jaci is a unisex's name of Portuguese origin, traditionally used in Christian families. The name means "Moon (Tupi-Guarani) — Jaci (Tupi-Guarani, from yacy 'moon') is the moon-goddess of Tupi-Guarani mythology, beloved of the sun-god Guaraci. Their nightly meeting in the sky's brief twilight produces the stars (caraca). A unisex Tupi name evoking lunar mythology and indigenous Brazilian cosmology." and belongs to the Light cluster — names meaning radiance, illumination, and hope.

Common among Brazilian, Indigenous, Portuguese families, Jaci carries cultural weight that goes beyond its dictionary definition — it's a name with a story and a community.

What would a baby named Jaci look like?

NameRoot imagines a one-of-a-kind AI baby portrait for every name, shaped by its heritage — the features, the colouring, the feeling a name like Jaci carries. No two are alike.

An AI-generated baby portrait in the NameRoot app, shaped by the name's heritage

See Jaci's portrait — and its full score — the moment you open the app.

See Jaci's baby portrait →

What does Jaci's numerology say?

Numerology assigns each name a single-digit destiny number by summing its letter values. Different schools use different mappings — NameRoot computes both so you can see how Jaci resonates in either tradition.

Pythagorean
5
freedom and adventurous change
Chaldean
6
nurturing and family devotion

Jaci's destiny number is 5 — but a number only matters in context. The app matches it to your family's own numbers for a real compatibility read. See Jaci's full reading →

Does Jaci go with your family's names?

Jaci breaks into 4 sounds: /JH-AA-K-IH/. The real test isn't how it sounds alone — it's how it sounds beside the names already in your family: yours, your partner's, and any brothers or sisters. NameRoot scores that harmony, so Jaci sits naturally next to a Mum and Dad like Michael & Anna, or a big sister named Gianna — no awkward clashes, no two names that blur together. Hear Jaci beside your family's names →

Names similar to Jaci

If Jaci resonates with you, these names live in the same world — drawn from the same tradition, sharing the same meaning, or echoing a similar sound.

From the same tradition

Other Christian unisex names, common in Brazilian families

Tonalli
Soul, spirit, day (Nahuatl) — Tonalli (Nahuatl tōnalli 'day, soul, fate') is one of the foundational Aztec/Nahuatl concepts. The tonalli is the soul-essence connected to the sun (tonatiuh) and the day of birth — Aztec sacred-calendar tonalpohualli derives from this root. A unisex Mexican-pride name evoking pre-Columbian spiritual cosmology.
Pindorama
Land of palms (ancient Tupi name for Brazil) — Pindorama (Tupi-Guarani, from pindó 'palm tree' + rama 'place of') is the indigenous-Tupi name for what is now Brazil — meaning 'land of palms.' The name predates the Portuguese arrival and is increasingly used by Brazilian indigenous-rights movements as the original name of the land. A unisex name evoking Brazilian indigenous identity.
Riley
Courageous, valiant — from the Irish Ó Raghallaigh, meaning brave. A surname turned given name, now embraced for both boys and girls.
Nico
Victory of the people, compressed into a name as quick and bright as a struck match — Nico is the pan-European short form of Nicholas and Nicole, carrying the Greek concept of popular triumph in two vivid syllables. It sounds at home in Rome, Amsterdam, and Buenos Aires, a name that belongs to no single country because it belongs to the spirit of celebration itself

Sharing the same meaning

Other Christian unisex names from the Light cluster

Bintang
Star — Bintang (Indonesian, from Sanskrit-Indonesian bintang 'star') is the Indonesian word for star. The Bintang Mahaputra is one of Indonesia's highest civilian honors, awarded for exceptional service to the nation. A pan-Indonesian unisex name evoking radiance and aspiration.
Ember
A glowing coal, the last persistent heat after the flames have died — Ember names a child for the quiet stage of fire, the red-gold glow that remains when the drama of the blaze is over.
Seren
It is soft-spoken and luminous, a name that glows rather than blazes and that carries its Celtic heritage with understated pride

Names that sound similar

Christian unisex names that open with the same syllables as Jaci

Jordan
The descending river, the sacred waters in which Jesus was baptised
Jamie
Supplanter, from Hebrew Ya'aqov via James. One of the few names equally at home on any gender
Jiwoo
Wisdom and universe — a modern gender-neutral Korean name that has surged in popularity, combining ji (wisdom) with woo (universe, space). It carries the aspiration for a child whose wisdom is as vast as the cosmos.

Explore more names

Keep exploring names like Jaci — by tradition, by meaning, or by first letter.

Christian unisex namesNames that mean lightNames starting with J All baby names

Common questions about Jaci

What does the name Jaci mean?

Jaci means "Moon (Tupi-Guarani) — Jaci (Tupi-Guarani, from yacy 'moon') is the moon-goddess of Tupi-Guarani mythology, beloved of the sun-god Guaraci. Their nightly meeting in the sky's brief twilight produces the stars (caraca). A unisex Tupi name evoking lunar mythology and indigenous Brazilian cosmology.." It is a unisex name of Portuguese origin, traditionally used in Christian families.

Is Jaci a boy or girl name?

Jaci is a unisex name, used for any gender.

What is the origin of the name Jaci?

Jaci is of Portuguese origin, used in Christian tradition, commonly among Brazilian, Indigenous, Portuguese families.

Is Jaci a Christian name?

Yes. Jaci is a unisex name traditionally used in Christian families, of Portuguese origin.

What does Jaci mean in Portuguese?

Jaci originates from Portuguese, where it means "Moon (Tupi-Guarani) — Jaci (Tupi-Guarani, from yacy 'moon') is the moon-goddess of Tupi-Guarani mythology, beloved of the sun-god Guaraci. Their nightly meeting in the sky's brief twilight produces the stars (caraca). A unisex Tupi name evoking lunar mythology and indigenous Brazilian cosmology.."

What is the numerology of Jaci?

Jaci has a Pythagorean destiny number of 5 — freedom and adventurous change.

See how Jaci scores for your family

NameRoot is the only baby-name app that scores every name across 6 signals against your specific family context. Download free — Jaci is waiting.

Get NameRoot — free