I like
Asher a lot. It's my favourite "
Ash" name, I slightly prefer Archer which I think is really similar.
On the surface I don't see anything wrong with
Asher Grey, except - and this is just me being picky - together the names bring to mind the physical ash, as in what is left after something in burned. The name
Asher doesn't bring this association normally but because ash is grey, the two names together bring this.
I like
Asher Clarke sounds very cool and superhero-ish, it goes well with Canela too! :)