anyone's guess

Something that no one knows for sure, as in Will it rain next Sunday? That's anyone's guess. [Mid-1900s] Also see your guess is as good as mine.

Name	Pronounced	Usage
Aca	-	Serbian, Macedonian
Aleta	-	English
Ryder	RIE-dər	English (Modern)
BergljÓT	-	Ancient Scandinavian, Icelandic
Billy	['bili]
Radzim	-	Polish