I am quite sure the Forbus name is distinctly of Scottish descent.It is Clan Forbes , but the ancient Gaelic pronunciation of "Forbes" was two syllables...For-beis,and that is how the Forbes clan members said it. Imagine the man at Ellis Island or a census taker hearing the name from a man with a Highland brogue..(partial explanation for the variable spellings ). Also, literacy was not at a very high level in these early times, so phonetics were relied on heavily. Faubus ,Forbus,Faubs,Forbes,Forbush,Forbis..etc. ,are all septs of clan Forbes Forbes is distinctly Scottish,not Irish, French, not English, not Welsh.Any connection to these countries came by the travel of the wayward Forbes' of Aberdeenshire.Since the crownings at Scone ,the Forbes Clan has been historically documented as Scots.