true believer

One who passionately supports a cause or concept. My sister is a true believer in social equality, so she is out at the protest today.

Name	Pronounced	Usage
Natasa	-	Greek
Astor	AS-tər	English (Rare)
Achinoam	-	Biblical Hebrew, Hebrew
Jane	JAYN	English
Hiba	-	Arabic
Satu	SAH-too	Finnish