I can only guess, but you should consult with Enwau Lleoedd Mon by Gwilym T.
Jones and Tomos Roberts (1996). I can say that since rhyd (ford) is a
feminine noun, it will lenite anything that follows the article, so you are
looking for something that gets you "cari". As a guess, I would say that is
is probably related to caer (fort or settlement), though you should check
Jones and Roberts to see what they say.
>===== Original Message From "CELTIC-L - The Celtic Culture List."
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>Apologies to those who have received this on other lists.
>I am looking for an idea of the meaning to the Anglesey ford name "Rhyd y
>Gari" (the Gari bit). It runs between RAF Valley and Holy Island.
>Thanks for any help.