The Collaborative International Dictionary of English v.0.48:

Ragman's roll \Rag"man's roll`\ (r[a^]g"manz r[=o]l`). [For
   ragman roll a long list of names, the devil's roll or list;
   where ragman is of Scand. origin; cf. Icel. ragmenni a craven
   person, Sw. raggen the devil. Icel. ragmenni is fr. ragr
   cowardly (another form of argr, akin to AS. earg cowardly,
   vile, G. arg bad) + menni (in comp.) man, akin to E. man. See
   Roll, and cf. Rigmarole.]
   The rolls of deeds on parchment in which the Scottish
   nobility and gentry subscribed allegiance to Edward I. of
   England, A. D. 1296. [Also written ragman-roll.]
   [1913 Webster] Ragnarok