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Wiktionary gives the following etymology:

Reduced Anglicized form of Irish Ó Fathaidh (“descendant of Fathadh”), a byname from fothadh (“base, foundation, support”).

Can we check this, since the spellings are different between the Wiktionary entry and this Wikipedia article? Which are correct?

2605:A000:FFC0:5F:F9BD:9D:B97C:57D4 ( talk) 23:49, 31 October 2023 (UTC) reply

I've removed it for now as the only sources I could find were user-generated. Suonii180 ( talk) 16:17, 2 November 2023 (UTC) reply