know a hawk from a handsaw

To be able to tell two things apart. The phrase comes from Shakespeare's Hamlet. Of course I know which twin is which, I know a hawk from a handsaw, after all!

Common Names:

Name	Pronounced	Usage
Sumantra	-	Bengali
Kapel	-	Yiddish
Fortunato	-	Italian, Spanish, Portuguese
Dada	-	Western African, Yoruba
Norina	-	Italian
Johann	YO-hahn	German