The story
- Latin · derived from-lorum
- English todaycockalorum
Possibly English cock (“rooster”), with -a- and Latin -lorum suffixed as a fanciful elaboration; or from a Dutch onomatopoeic dialect term kockeloeren (“the cry of a rooster; cock-a-doodle-doo”), hence the modern Dutch verb koekeloeren (“to crow”).
Etymology from Wiktionary, CC BY-SA 4.0.