It's anybody's guess

No one knows, so anyone's guess is as good as anyone else's. A: When will the messenger be here? B: It's anybody's guess.

Name	Pronounced	Usage
Mechislav	-	Russian (Rare), Medieval Slavic
Toufik	-	Arabic
Estella	es-TEL-ə	English
Ram (1)	-	Biblical
Nan	NAN	English
Khrystyna	-	Ukrainian