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Gender: F Origin of Tacy: American invented name

Looks very much like it lost its first initial.

Famous People Named Tacy

Tacy Atkinson, American missionary during the Armenian genocide

Pop Culture References for the name Tacy

Anna Anastacia "Tacy" Kelly, character in the Betsy-Tacy series by Maud Hart Lovelace
Tacy Bolton Collini, Lucille Ball's character in the 1953 movie The Long Long Trailer.
Could be a nickname for the name Tacita