[5] Margerðr: This troll-woman name is otherwise known only from Hjálmþés saga (ch. 12, FSN III, 482, 484-5). Cf. other names with ‑gerðr as the second element (see sts 3/1, 6, 4/3). The first element is possibly either from marr m. ‘sea’ or from marr m. ‘horse’ (Finnur Jónsson 1934-5, 307), but cf. also mara f. ‘nightmare’ (see Motz 1981, 504).