In Irish it's "abhainn" In Scots Gaelic it's "abhainn" In Welsh it's "afon"
The English surname Clifford has no Scottish Gaelic form.
Abhainn = River: Irish Gaelic.
a haon [In Irish, "a haen"] Scottish Gaelic is:
Please specify Irish Gaelic or Scottish Gaelic: they are two separate languages.
"Gaelic" can mean "Irish Gaelic' or "Scottish Gaelic". They are classified as two distinct languages.
That is not a Scottish Gaelic word. It may be a word in the English dialect of Scotland ("Scots" or "Lallans"). Gaelic has no 'w' or 'y'.