[Facts] Spanish diminutives
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Names like this are very difficult to track down. They seem sort of like nursery forms of names that take more effort to pronounce. Bob and Bill are similar in English. Pepe might come from the "se" sound. All the Francisco names seem to be coming from the i, s and o. And the Jesus ones from the u. I think it looks like soft sounds get a C-H and hard sounds a P.