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
Belenos	-	Celtic Mythology
Young-Gi	yung-gee	Korean
Aurelius	-	Ancient Roman
Ansgar	AHNS-gahr (German)	German, Swedish, Norwegian, Danish, Ancient Germanic
Narcissus	nar-SIS-əs (English)	Greek Mythology (Latinized), Late Roman, Biblical
Klaudie	-	Czech