Aww I get the 'be kind' you've got to be thick skinned for Mumsnet, it's a bizarre place I've been absolutely flabbergasted at the comments I've seen on here! Looks like everyone has been kind.
These sort of names are not usually my taste but
Rocky - actually kind of like it, I associate it with the movies and the films and character are pretty damn cool!
Sydney - I like, but I get why some people suggest it's feminine, if spelled Sidney it's definitely masculine.
Phoenix - I first heard this 13 years ago when a friend had a boy called Phoenix, I thought it was absolutely bonkers at the time, but now seems fairly normal, although it's going to be very out there for some people.
Harrison - I know a 12 year old Harrison, I love it.
Sonny - also love, I know 1 ten year old, I wouldn't say it's terribly popular here. I half wished I'd had a 3rd son to use this name, although I'd have possibly have used the 'Sunny' spelling, short for sunshine (although there's no way anyone would have let me get away with that!)
Good luck 😊