Names

[jwatts1981]

Where does the name tacky come from for a person last name

[Mamyalynne]

C&P

Tacky (Hassaniya-Arabic: ﺍﻟﺘﻘﻲ) occurs in Senegal more than any other country or territory. It may appear as a variant

[Mamyalynne]

https://forebears.io/surnames/tacky

[Buenchico]

I'll agree with Maya if the person is of African heritage.

If they're not though, there's a possibility that it might be a corruption of the English surname 'Tache', which was derived from a French nickname for someone with a birthmark or scar.