Aside from Smiths of English or Scottish origin (especially in Ulster) the narive Irish surnames MacGowan (Mac Gabhann/Mac an Ghabhann) and O'Gowan
(Ó Gabhann) were often changed to Smith.
In Irish it's "síocháin"
William isn't an Irish name but the Irish variant is Liam and it means vehement protector.
Ethel Smyth's birth name is Ethel Mary Smyth.
Sinead Smyth's birth name is Sinead Vittoria Smyth.
Luch in Old Irish Gaelic is topo ("mouse") in Italian.
No Irish form of the surname Bindon. It is an English name common in Somerset.