Grantly - I don't like this, it sounds too old fashioned, i love old fashioned names but this one to me is one of the not so nice ones. I imagine a shy, intelligent boy/man, a little geeky, a bit of a loner.
Holden - I don't like this either. Its sounds a bit "trendy", like Brooklyn, Knox, etc.
I imagine him being a bit of a handful, boisterous, not interested in school, he is very popular though, has lots of friends, but a bad crowd.
Ari - I don't like this, its sounds a bit feminine and also to me it sounds like its incomplete. But i guess imagine him to be artistic and into music. A little scruffy. A nice person. Also, i feel like he would not be bothered by materialistic things and loves nature and is a bit "green".
Eloise - I like this, its very pretty. I like the nickname Louie too. It is a very strong feminine name.
I can imagine her to be very intelligent, a pretty girl, very friendly. I can imagine her being really good at English Literature, she likes reading and poetry.
Kaya - I don't like this, no reason as such i just don't like the sound of it. I can imagine her to be a loud but friendly girl. Into sports and loves socialising.
:)