Acacia - no. Pronunciation issues, a lifetime of ‘what, like the plant?’ and ‘what, like from bananaman?’....
Jane - fine
Cassie - like this, either on its own or as a shortening for Cassia as suggested by PP - less keen on Cassandra or Cassiopeia
Owen - fine
Jonah - aside from the whale associations (if this bothers you, it may not...) also fine
Silas - dislike - I think it’s the sibilance, sounds kind of slimy and hissy.
Richard - fine
My favs are Cassie and Jonah