Not all scholars accept the "gwalch" derivation. Celticist John Koch suggests the name could be derived from a Brythonic original "*Wolcos Magesos", "Wolf/Errant Warrior of the Plain." Others argue that the continental forms do not ultimately derive from "Gwalchmei". Medievalist Roger Sherman Loomis suggests a derivation from the epithet "Gwallt Avwyn", found in the list of heroes in "Culhwch and Olwen", which he translates as "hair like reins" or "bright hair". Dutch scholar Lauran Toorians proposes that the Dutch name Walewein (attested in Flanders and Northern France c. 1100) was earliest, suggesting it entered Britain during the large settlement of Flemings in Wales in the early 12th century. However, most scholarship supports a derivation from Gwalchmei, variants of which are well attested in Wales and Britain. Scholars such as Bromwich, Joseph Loth, and Heinrich Zimmer trace the etymology of the continental versions to a corruption of the Breton form of the name, "Walcmoei".