Nigel is weird for me. The sound is nms at all, and it's really not something I'd ever go for, but recently I've begun to really appreciate it as a name.
Nigel. It's unique but not unheard of, traditional but carrying a sort-of "revival spunk." It's a name that I'm happy exists, but wouldn't personally use in a million years. Except maybe for a fish. I think it's totally fine in the first or middle name spot.