(I'll be) hanged if I know!

I have absolutely no idea! A: "How are you supposed to turn on this newfangled computer?" B: "Hanged if I know!" I'll be hanged if I know how to fill out these tax forms!

Common Names:

Name	Pronounced	Usage
Qasim	KAH:-sim (Arabic)	Arabic, Urdu
Gamal	-	Arabic
Elizaveta	ye-lee-zah-VYE-tah, ee-lee-zah-VYE-tah	Russian
Dalia (1)	-	Spanish (Latin American), American (Hispanic)
Kate	KAYT (English)	English, Croatian
Summer	['sʌmə]