Anglicized form of Carolus (see Charles), or of its feminine derivative Carola. It has never been common as a boy's name, and has become even less so since its growth in popularity as a girl's name. This seems to be of relatively recent origin (not being found much before the end of the 19th century). It probably originated as a short form of Caroline.
English (chiefly southern Lancashire): habitational name, probably from some place named as being a boggy place, from Old English mersc ‘marsh’ + land ‘land’. Alternatively, it may be a variant of Markland.