Use your head!

and Use your noggin! and Use your noodle!

exclam. Think!; Think it through! You know the answer. Use your head! Use your noggin’, dogg!

Name	Pronounced	Usage
Garbi	-	Basque
Gennadiya	gye-NAH-dee-yah, gee-NAH-dee-yah	Russian
Davud	-	Persian
Ingmar	ING-mahr	Swedish
Liam	LEE-əm (English)	Irish, English
Leontius	-	Ancient Greek (Latinized)