Re: Krin, Krinnen, and Krynn
Krin Dreegan sounds like a male fantasy character to me. (It's not surprising that it's already used in fantasy; it has that feel.) It sounds decent, and would work on a real person (especially in California for, say, an entertainer's kid), but it definitely is fanciful. To me personally, it reminds me of "cringe" and "crick" and sounds harsh on my ears. But it's decent; it's not too eccentric or attention-grabbing for my taste. There are many names in roughly the same category that I like, myself.
But it's invented ... obviously. If it has some meaning as a word in another language, that doesn't change the fact that it's an invented name you chose for its sound and look. It's not a "real" name. It's just not. I personally am okay with inventing names. I think it's fine. Once someone is named it, it's real enough! But I'm not impressed with attempts to make it seem as though an invented name is "real." If you like fanciful names that much, just go ahead and like them; etymology buffs need not be impressed.
I favor the spelling Cryn. I don't care for Dreegan; it reminds me of Dweezil too much for some reason.