a know-all

(British & Australian) also a know-it-all (American & Australian)

someone who seems to know everything and annoys other people by showing how clever they are No one likes him because he's such a know-all.

Name	Pronounced	Usage
Ronja	RON-yah	Swedish
Gunnar	GOON-nahr (Swedish)	Swedish, Norwegian, Danish, Norse Mythology
Bertrando	-	Italian
Joel	JOL (English), JO-əl (English), ho-EL (Spanish), zhoo-EL (Portuguese), YO-el (Swedish, Finnish)	English, Spanish, Portuguese, Swedish, Finnish, Biblical
Beata	be-AH-tah (Polish, German)	Polish, German, Swedish, Norwegian, Danish, Late Roman
Griselda	gri-ZEL-də (English)	English, Scottish, Spanish, Literature