What an interesting name! Through Googling I have found several examples, most in Venezuela. There is a woman named Yugle Rivas in Maracaibo, Venezuela who has some fame there as a "psychological coach" for children. It is not listed in the Spanish language name dictionaries I own.
I have found a couple of instances of what seem to be Yugler as a male name in Venezuela, and one instance of what seems to be Yugler as a surname in Venezuela. Yugler is a rare surname in the USA, where it seems to belong to a Jewish family. My best guess for the derivation of the surname Yugler is that it's an Americanized spelling of the
German surname Jugler, which was derived from a place called Jugel in Saxony.
So one guess might be that the surname Yugler first became a rare male given name in Venezuela, and then Yugle developed as a feminine form of that. But I must emphasize this is a speculative answer -- we would need a lot more evidence to be sure of this as the origin of Yugle.