Here in Aus, I think they are pretty much always pronounced ar. Well, except
Sarah which is always Sair-.
Sara is Sah-ruh though, and the others are said the same way. I know one
Sara said
Sarah, and one
Clara said Clair-uh, but the first has Candian parents and the second American.
I think
Tara said Tair-uh is one of the ugliest things I've heard. I like the -ar prn. much better than the -air ones.