Sunny

Cheer

The word cheer originally meant face or countenance; later, a shout of encouragement

Smile

Sonne

German and Danish word for the sun

Sonnie

A variant of Sonny

Sun

An alternate transcription of Korean Hangul 선 (Seon)

Sunshine

From the English word, from Old English sunne "sun" and scinan "shine"

Bobby

Diminutive of Bob, from Bob + -y

Brite

Not documented as a name with a meaning in the sources checked

Giddy

Not documented as a word with a meaning; recorded as an English given name

Jolly

English word meaning cheerful or happy; recorded as a rare given name in American English