Where does “Harlequin” come from?

Harlequin (Middle French) comes from Old French Harlequin, from Old English Herla Cyning — {{w|King Herla}}.

Ancestry of “Harlequin”, step by step

Step	Language	Word	Meaning
1	Old French	Harlequin	—
2	Old English	Herla Cyning	{{w\|King Herla}}

Harlequin — Etymology, Origin & Word History | Etymology Explorer