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
Carleton	KAHRL-tən	English
Guendolen	-	English (Rare)
Shrinivas	-	Indian, Marathi
Johna	JAHN-ə	English (Rare)
Mikail	-	Turkish
Fridtjof	FRIT-shof (Swedish), FRIT-yof (Swedish)	Swedish, Norwegian, Danish