Hi there! I really like the name Aleydis and was unable to find ANY information on it, even when I did an internet search. There was a character named Aleydis in the book GIRL WITH A PEARL EARRING and that's where I heard it. It's interesting to hear that it's common in Spain! I even asked a close friend who was born and raised in Germany but now lives in Austria, and she said she'd never heard of the name. Interesting since it has English/Dutch roots (maybe?). Sorry this wasn't of much help!