This one’s kind of an in-joke. The street was originally christened Welsh Avenue in 1913 to honor Lawrence Martin Welsh (1875-1959), one of Culver City’s original five incorporators. (Of his partners, only Harry H. Culver and Delphin Delmas still have namesake streets.) “Welsh” also refers to the people and language of Wales, and since Cardiff is the capital of Wales, well, you get the idea. But why the name change (in 1917)? No explanation was given, but the term “to welsh” – meaning to renege on a promise, agreement, or payment – was certainly in use at that point, so it’s possible that the street’s property owners didn’t want to be associated with deadbeats. P.S. Lawrence Welsh himself was Scottish.