Dorothy - I like it, although prefer Dorothea. Dora, Dorrie and Dot are all great short forms
Lainey - if it’s short for Eleanor or Helena it’s ok, but as a full name it sounds like a character from a US day time soap
Ottilie - I really don’t like it but it’s popular
Rosie - v overdone, but anyway I think you need Rose or Rosanna or something as a more grown up full form
Honey - daft. And both sexist and a lot of pressure for a little girl to have to live up to being sweet.
Wren - faddy, overdone and will date
Lennon - do not call a girl Lennon, I beg of you. If you like Lennie as a nickname then Eleanor or Selena gives you that.
Boys
August ( nn Gus) - nice, suddenly very popular. I prefer Augustus
Sebastian - lovely and quite popular
Fabian - lovely and underused
Brandon - I quite like it but it has naughty boy vibes to the average teacher, I suspect
Atlas - he carried the world on his shoulders so it’s a bit harsh. Atticus ?
Mason - naff
Ralph - it sounds like a small dog yapping, unless you want to pronounce it Rafe, which is nice, but you’d be better spelling it Rafe