I love the name
Stanley on animals. On any kind of pet, it immediately bestows so much warmth and personality, either charmingly curmudgeonly or adorably sweet, depending on the animal's nature. It's like it enhances it. On a person, it's still a bit blah, dated in a boring way. I would be very surprised to hear about a baby
Stanley, that might be actually be quite cute.
I like
Sidney a lot, certainly much more for a boy than a girl. I like that it sounds so slick and has a bit of a rapscallion vibe. I think of a film noir detective or a fast-talking actor in an early talkie. It's on par with a name like
Victor or
Vincent - stylish yet slippery.