Quite an 80s sounding list to my ears
GIRLS
Ramona - it's ok. Popular children's book heroine isn't she?
Roxanne (Roxy) - 80s porn star
Laura - ok. Classic, slightly boring
Tara - not keen
Thea - love it
Indy - nice as a nickname for India or Indiana
BOYS
Ross - don't like it
Parry - hate it
Tom - nice, prefer Thomas
Austin - ok
Lorne - hate it
Ryan - not keen
I'd go for Thea or India and Thomas.
How about:
Rowena, Romily, Robyn, Rosie, Lara, Lana, Teagan, Tiana, Taylor, Isla, Iris
Robin, Reuben, Preston, Tristan, Aaron, Aiden, Ashton, Liam, Logan