| Rhaeadr ar [[Afon Hen]] yng [[Cwm Gwared|Nghwm Gwared]], plwyf [[Clynnog Fawr]], yw '''Rhaeadr Dibyn Mawr'''. Nid yw’r enw ar fapiau’r Arolwg Ordnans ond mae’n bur gyffredin mewn llyfrau taith o’r bedwaredd ganrif ar bymtheg a dechrau’r ugeinfed ganrif.<ref>Er enghraifft, W. Bingley. ''[https://archive.org/details/northwalesdelin00binggoog/page/n432|North Wales; including its Scenery, Antiquities, Customs]''. 2 gyf. (London: T. N. Longman and O. Rees, 1804), cyf. 1, t. 402; Askew Roberts ac Edward Woodall, ''[https://archive.org/details/gossipingguidet01woodgoog/page/n192|Gossiping Guide to Wales (North Wales and Aberystwyth)]'' (London: Simpkin, Marshall, Hamilton, Kent & Co., 1902), t. 112.</ref> Mae hefyd wedi cael ei alw'n ‘Hen Waterfall’ yn Saesneg.<ref>John Llewelyn Jones, ''[https://archive.org/details/waterfallsofwale0000jone/page/220|The Waterfalls of Wales]'' (London: Robert Hale, 1986), t. 221.</ref>
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