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
Herminia	er-MEE-nyah (Spanish)	Spanish, Ancient Roman
Tethys	TEE-thəs (English)	Greek Mythology
RÍOghnach	-	Irish Mythology
Viljem	-	Slovene
Jayna	JAY-nə	English (Rare)
Gerd (1)	GERT (German), KHERT (Dutch)	German, Dutch