Sonny vs. Sunny — What's the Difference?

Sonny is a common nickname and occasional given name. It can be a derivative of the English word "Son", a name derived from the Ancient Germanic element *sunn meaning "sun", a nickname derived from the Italian given name Salvatore (especially in North America, amongst Italian Americans), or the Slavic male name Slavon meaning "famous, glorious".

Exposed to or abounding in sunshine

Used as a familiar form of address for a boy or young man.

Cheerful; genial

(dated) a familiar form of address for a boy

(of weather or a day) Featuring a lot of sunshine.

Form of address to a boy or man, to express contempt, warning etc.

(of a place) Receiving a lot of sunshine.

A male child (a familiar term of address to a boy)

(figuratively) Cheerful.

Of or relating to the sun; proceeding from, or resembling the sun; shiny; radiant.

Sunny side up

A sunfish.

Of or pertaining to the sun; proceeding from, or resembling the sun; hence, shining; bright; brilliant; radiant.

Exposed to the rays of the sun; brightened or warmed by the direct rays of the sun; as, a sunny room; the sunny side of a hill.

Cheerful; genial; as, a sunny disposition.

See Sunfish (b).

Abounding with sunlight;

Bright and pleasant; promoting a feeling of cheer;