I'm hanged if I know!

I have absolutely no idea! I'm hanged if I know how to fill out these tax forms!

Name	Pronounced	Usage
Iscah	-	Biblical
Eirenaios	-	Ancient Greek
Tania	['tæniə]
Sigrid	SEEG-reed (Finnish)	Norwegian, Swedish, Danish, Estonian, Finnish (Archaic)
Niels (2)	NEELS	Dutch
Otmar	-	German, Ancient Germanic