Where does “whimsic” come from?

whimsic (English) comes from English whimsy, from English whim, from English whim-wham — A whimsical object; a trinket; A whim or fancy.

Ancestry of “whimsic”, step by step

whimsic traces back through two separate lines of ancestry.

via English whimsy

StepLanguageWordMeaning
1EnglishwhimsyA quaint and fanciful idea; a whim; playfully odd...
2EnglishwhimA fanciful impulse, or whimsical idea; A large...
3Englishwhim-whamA whimsical object; a trinket; A whim or fancy

via English ic

StepLanguageWordMeaning
1Englishicrelated or pertaining to; having the character of
Every word from English whim-wham