As a non-native english speaker,''th'' was a bit hard to learn. In fact, in French, some names have kept the ''th'' but considering the sound doesn't exist in French, it's just pronounced as a 't'. But now that I'm able to say it properly, I do like names with the ''th'' sound.
Here are some I like:
Agatha,
Althea,
Dorothea,
Edith,
Elizabeth,
Ethel,
Faith,
Hyacinth,
Ruth (yes even if it's a bit dated),
Theresa.
Nathaniel,
Theodore,
Timothy and
Thomas.
Do names like
Esther or
Mathilda would count? I feel the ''th'' is less pronounced in these example.
Don't hesitate to rate my different PNLs:
http://www.behindthename.com/pnl/246179