Very rare: Wicklow etc. Ir. Mac Gabhann or French Gouin. The latter were in Tipperary at the end of 17 cent - presumably Huguenots.
fairly rare: Laois, Carlow. Ir. Mac Gabhann. The name, in the form Going, has been in Tipperary since 17 cent and a suggestion of a connection with the French Gouin, meaning blood-relative, has been made by MacLysaght. See Going.MIF & SGG.
Gwynne: cuíosach annamh: Ulaidh & rl. Ón ainm Breatnach gwyn = fionn. Bhí siad in Éirinn ón 16 céad agus, mar scoláirí, dhein seirbhís mhór don náisiún sa 19 & 20 céad
rare: W Meath, Wicklow. This seems to be the Huguenot Guin. See Going.