I have to agree with the others that Thayer feels like a more masculine name for me. I do like
Thea and
Theia quite well, I'd stick with those personally!
Thayer
NatalieThayer
EliseThayer
Adele /
AdelaThayer
AmeliaThayer
CamillaThayer
EmmelineThayer
ClementineThayer
EsméThayer
Estelle /
EstellaThayer
Grace Thayer
EleanorThayer
Lily