Jaci
/JH-AA-K-IH/
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.
Get Jaci's full report — patron saint, feast day & a portrait — freeQuick — what every Christian parent asks about Jaci:
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 your family & your heritage, and your baby's birth details.
Unlock Jaci's score — free
Six signals — scored for your family & heritage, not in the abstract:
Meaning & origin
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.”.
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.
The patron saint & feast day behind Jaci
Many Christian names carry a patron saint and a feast day (name day) — a tradition of choosing a name for the saint a child is born near, or one the family holds dear. Jaci lives in this tradition of meaning and heritage.
NameRoot connects the dots. See Jaci's patron saint, its feast day, and whether it aligns with your baby's birth — alongside its full family score.
See Jaci's saint & feast day →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.
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
Sharing the same meaning
Other Christian unisex names from the Light cluster
Names that sound similar
Christian unisex names that open with the same syllables as Jaci
Explore more names
Keep exploring names like Jaci — by tradition, by meaning, or by first letter.
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
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