Its relative, "quick", has some weird historical attachments as well -- it can mean both "rapid" and "alive" (as in "quicksand" or the "quick" of a nail).
The most common example of this sense today would be "fasten".
Likely also "quicksilver"?
https://en.wikipedia.org/wiki/Indo-European_vocabulary
English "heart" is in French, "coeur", and in Greek, "kardia". Unrelated? No! In Proto-Indo-European we think it was "k̂erd"! Soften the leading k, stop voicing the final d, jiggle the vowel, and you get "heart". Lose the final d and you get "coeur". Jiggle the vowel, add a trailing vowel for streamlining, and you get "kardia".
Better yet, soften the leading k and you get "hṛd", the Sanskrit word. Add a trailing vowel, and you get "hŕday", the Hindi word in use today (or so wiktionary tells me).