I think
Sloane is a horribly ugly and downbeat name, and also, I don't see it as flowing well with other names at all. It's likely to just sound like Slowin' Middlename, not attractive at all.
And it's sure not unique. It's pretty tryndee, like
Harlow and McKinley, not really popular yet but kind of Hollywood Popular.
I was reading a news story last week, and a spokeswoman for some school district or other was named
Sloane Roach. So ugly.