[name_m]Hi[/name_m] there.
Nice list!
Here are my thoughts-
[name_m]Calum[/name_m]-I love it. And I love this spelling. It looks sleeker, & makes more sense if you want to use the nn [name_u]Cal[/name_u]. [name_m]Calum[/name_m] is one of those names that’s sporty, outdoorsy, smart & very masculine yet gentle at the same time.
[name_m]Fraser[/name_m]-It’s growing on me. I think I have a hard time getting past [name_u]Kelsey[/name_u] Grammer. He’s not bad…it’s just a strong association. I’m guessing that’s not an issue for younger people though. It’s unique & has a posh British vibe. I think that’s pretty cute.
[name_m]Clive[/name_m]-Very cool choice. I rarely see this on lists, but often suggest it. It has a fresh, simple approachable feel. And also a hint of cowboy-ness. It’s super unique, but not at all complicated.
[name_m]Brogan[/name_m]-I’m not a fan of this one. That ‘bro’ beginning just isn’t that appealing to me.
[name_m]Gareth[/name_m]-Fun! This is very different, yet doesn’t sound too out there. It’s strong & masculine, but also has a gentle vibe.
[name_m]Rogan[/name_m]-I quite like [name_u]Rowan[/name_u] & [name_m]Ronan[/name_m], but can’t get into this one. It has a really strong association w/Joe [name_m]Rogan[/name_m]. Who is fine…just has a very macho feeling that I don’t personally care for.
[name_m]Steen[/name_m]-Hm. This doesn’t have a super pleasant sound in my opinion.
[name_m]Ferris[/name_m]-Ooh, I like this one! It’s like [name_m]Fraser[/name_m], but less snooty & more cool. Maybe that’s thanks to [name_m]Ferris[/name_m] [name_m]Bueller[/name_m]. 
[name_u]Sterling[/name_u]-I kind of like this. This spelling looks much nicer in my opinion. It’s interesting.
A few suggestions that you may like-
[name_u]Alden[/name_u]
[name_u]Brennan[/name_u]
[name_m]Cullen[/name_m]
[name_m]Desmond[/name_m]
[name_u]Ellis[/name_u]
[name_m]Fergus[/name_m]
[name_m]Hamish[/name_m]
[name_m]Knox[/name_m]
[name_m]Lachlan[/name_m]
[name_m]Magnus[/name_m]
[name_u]Niall[/name_u]
[name_u]Rafe[/name_u]
[name_m]Thatcher[/name_m]
[name_u]Wilder[/name_u]
[name_f]Hope[/name_f] this helps. 