etymologeek.com dictionary
English word snappy comes from English -y, English snap.

Snappy etymology history

Snappy detailed word origin explanation

Dictionary entryLanguageDefinition
-y English (eng) Forming abstract nouns denoting a state, condition, or quality.. Used in the name of some locations which end in -ia in Latin. Forming diminutive nouns. Also used for familiar and pet names as a term of endearment. Added to nouns and adjectives to form adjectives meaning “having the quality of”.. Added to verbs to form adjectives meaning "inclined to".
snap English (eng) (informal) Done, performed, made, etc. quickly and without deliberation. (American football) The passing of a football from the center to a back that begins play, a hike.. (UK, regional) A small meal, a snack; lunch.. (colloquial) Something of no value.. (obsolete) A greedy fellow.. (physics, humorous) jounce (the fourth derivative of the position vector with respect to time), followed by [...]
snappy English (eng) (informal) Irritable.. (informal) Rapid and without delay.. (informal) Tidy; well-dressed; sharp.. Chilly, brisk, sharp.

Words with the same origin as snappy

Descendants of -y
andy apply bags bunny creepy dummy funny handy healthy heavy kitty mommy pretty pussy risky rocky rusty scary sexy shitty skinny sonny tiny tony woody