[6] marhrísla (f.) ‘mare-twig’: A hap. leg. This name has been explained as ‘birch-twigs tangled from being ridden by a mara’ (ÍO: marhrísla; cf. New Norw. marekvist, ModSwed. markvist), formed from mara f. ‘nightmare, ogress’ and hrísla f. ‘twig’ or ‘sprig of a branch’.