Jaci 1

Jaci is the ancient goddess of the moon in the Tupi-Guarani mythology.

Alternatively, the name bestowed by two former hippies turned pillars of society, named Jack and Cieli, on their daughter (Ja + Ci = Jaci). Pronounced "jay-cee," not "jacky," though the accent is on the a.

First of all, the Tupi language's background is rather complex. To sum it up briefly, it is a name for the group of similar languages that the Indians in Brazil use. The most common of these languages is Old Tupi, more commonly known as Nheengatu or the "fine language", spoken in the Rio Negro region.

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Secondly, in the U.S.A and in the U.K., Jaci is either a nickname for Jacintha, Jacinda, or Jaclyn. Though I do have to admit the meaning for the Tupi word is pretty.

Jaci is really a Native American name. It came from Tupi "îá sy", and it's the name of the Tupi moon goddess.

According to this site Jaci is not a Native American name:
http://www.native-languages.org/wrongnames.htm
[noted -ed]

Excuse me, Jaci IS a native American name. It's the tupi name for Moon, who sometimes is a man, and sometimes a woman.

Also could be a nickname for the name Jacinda or phonetic spelling of the initials J. C. Also spelled Jacee, Jacey, Jacie, Jasee, Jasey.