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I'm sure Hildreth is English and I'm sure I've heard of it before. However I've checked my usual sources and none mention it. All I've found is a notice of a mediaeval gent called Hildred of Carlisle. I think this supports Andy's suggestion that it's an old Germanic personal name.
Camacho is found in Spain and Portugal. It may have develped independently in both countries, though it's more likely to have a single origin in one country and spread to the other. Jean Tosti suggests "bandy-legged" as the meaning, but that's a guess based on the Celtic word cam, meaning "bent".