I'm not seeing an oipinion: just a list.
Colin? Maybe if parents wanted to use
Colin and had a daughter instead, they might consider
Collyn, but why, when
Colleen exists?
Alex - all the
Alexa people I know never shorten it.
Brandi or -y is so dated and was always fem.
Carl for boys,
Carla, nn
Carl if necessary, for girls.
Andy, yes but as a nn; I knew an
Ann who was sometimes called
Andy. Tomison - if you have seen this IRL, you can submit it, but I certainly haven't.
Wren seems fem. I'm not familiar with
Kalani.
Shay is male to me, derived from
Seamus; I don't appreciate it because it's just too close to Shame.
Ash- names could be either; I dislike them all.
Aston, mn
Martin? I find car names unfortunate.
Blair,
Blake and Brook(e) seem exclusively American so far.
Camryn probably fem.
Chandler is a ln and was a male occupation.
Coby?
Coby, in the form of Cobie or, more likely, Kobie, works as a nn for Jakoba so fem is fine.
Dallas, not outside the US.
Darian?
Darien is geographical, but I've never seen it with an -a- or on a human.
Derby, like the horse race - just another place name. Sorry, Lsia, I'm getting thoroughly bored with this. I'll be selective:
Dylan, m.
Leigh, preferably f.
Morgan, m.
Robin, m.
Teddie, who knows;
Teddy, m.
Toby, like my cat, m, The rest can be whatever anyone likes; I haven't seen them IRL and wouldn't use them.