is anyone's guess

something is anyone's guess

also something is anybody's guess

no one knows the answer How the lawsuit will turn out is anybody's guess. At that point, whether he was dead or alive was anyone's guess.

Name	Pronounced	Usage
Rosmunda	-	Ancient Germanic
Setsuko	se-tsoo-ko	Japanese
Andromache	ahn-dro-mah-ke (Ancient Greek)	Greek Mythology
Kaimana	-	Hawaiian
Carpenter	['ka:pəntə]
Ailsa	-	Scottish