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
Aysu	-	Turkish
Helmold	-	Ancient Germanic
Whitaker	['hwitəkə(r)]
Bedivere	-	Welsh Mythology, Arthurian Romance
Kinga	KEEN-gah (Polish), KEEN-gaw (Hungarian)	Polish, Hungarian
Sigeberht	-	Anglo-Saxon