take a guess

and hazard a guess; make a guess

to guess. Even if you don't know, please take a guess. If you don't know the answer, hazard a guess.

Name	Pronounced	Usage
Abrams	['eibrəmz]
Gennadi	gye-NAH-dee, gee-NAH-dee	Russian
Ioan	-	Romanian, Welsh, Bulgarian
Fortune	FAWR-chən	English (Rare)
BjØRg	-	Norwegian
Lusine	-	Armenian