Qrow!
but yeah, i totally see the pattern of animal names generally relating to animals associated with power and strength - Tiger, Bear, Wolfe etc - or relating to delicate/fragile/more animals - Fawn, Wren, Dove etc - although don't even get me started on Bunny and Kitty.
but equally, other strong, fierce animals wouldn't be perceived as acceptable names - like actually naming a kid Lion - as opposed to Leo - or Gorilla, Cheetah, Hippo or whatever, although i can totally see Jaguar catching on!
tbh, it's Sparrow that's a weird one for me. i totally get that people have started using it because it's a celeb baby name, used by Nicole Ritchie, but it's definitely a name more common for boys, and seems to have become fairly socially acceptable - yet it seems like such a frail, weak little bird to name your kid after - unless it is associated more with a sparrow hawk then a little sparrow.
ahaa, i would genuinely love to see a celeb name their child after a totally random animal, like Frog or Pangolin or Axolotl, and watch it become super popular! like i said before, Otter is a totally random one, yet it has a similar sound to Ottilie, which has become fairly popular, so it doesn't surprise me that it has caught on, as a YoUnEeK variation!