The Wikipedia article indicates an equivalent Scottish Gaelic surname, Mac a' Ghobhainn, meaning "son of the smith". It is the source of the English surnames: MacGowan, and McGowan; and (in Glasgow and Moray) MacGavin and McGavin.https://en.wikipedia.org/wiki/Mac_a'_Ghobhainn
https://en.wikipedia.org/wiki/Mac_a'_Ghobhainn