key figure

n. an important person in an event; a person central to an event. Sam is not exactly a key figure, but he can lead us to Mr. Big.

Name	Pronounced	Usage
HasİP	-	Turkish
Eleanora	el-ə-NAWR-ə	English
Muirgheal	-	Irish
Artakhshathra	-	Ancient Persian
Dagmar	['dægma:]
Antigone	an-TIG-ə-nee (English)	Greek Mythology