There're a lot of Latin loan words in Irish as well, but as with Welsh these
are mostly words dealing either with imported technology or religion. Tarbh
is a native Irish word, but Irish and Welsh and the other Celtic languages
are part of the greater Celtic-Italic language group from which Latin was
also derived; I don't have an Indo-European dictionary sitting in front of me
just this minute, but I'm pretty sure there are similar cognates in Hindi/Urdu,
Slavic, Germanic and so forth...
At any rate, as best I remember ("OK brain, I don't like you and you don't
like me, but let's get this over with and I'll go back to killing you with
beer...") the divergence between Brythonic (Welsh etc) and Gaelic (Irish etc)
Celtic occured 2500 to 3000 years ago, and between Celtic and Italic even
But I suppose I ought to look all this up again before I dig myself into too
deep a hole.
Arne Carlsten, Anthropology and Criminal Justice, Northern Arizona University