Uther is a rather dodgy name. It's not likely to be Welsh, not least because of the pronounciation problems; nor does Uther appear in any of the early Welsh Arthurian literature. Try an Arthurian site/Arthurian names specialist (I'm sure they exist) as the name was probably invented for the Arthurian romances as they developed in the Middle Ages. Possibly the name is the invention of Geoffrey of Monmouth - I wouldn't like to bet.
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