So: Clare is Clara, the Catholic saint and originally Latin "the pure". It does not seem to be in the RUssian Orthodox calendar, hence no Клара in the former Soviet Empire. Sorry!
The Russian equivalent of the English name Tyler is Тайлер (pronounced as "Tay-ler").
The Russian equivalent of the English name David is "Давид" (pronounced Dah-VEED).
Dimitri
Stacey
Revekka although I don't think it's a very common name.
Джудит Dzhudit
The name Kaitlyn does not have a direct equivalent in Russian. It is an English name derived from Katherine, which means "pure" or "clear" in Greek.
The Russian equivalent of the name Michelle is Мишель (Mishel).
Sarah is pronounced the same in Russian as it is in English, but it's spelled Сара.
The Russian equivalent of the name Ashley is Алёна (Alena) or Анастасия (Anastasiya).
The Russian equivalent of the name Marion is Марион (Marion).
Клиффорд. Pretty much a direct translation of the name.