Ето извадка от OED:

[OE. (West Saxon) Wilisc, Wylisc, (Anglian and Kentish) Welisc, Wælisc, f. Wealh, Walh, Celt, Briton, = OHG. Walh, Walah (MHG. Walch, G. Wahle) Celt, Roman, etc., ON. *Valr (pl. Valir, Gauls, Frenchmen): see etym. note to WALNUT, and cf. WALACH and VLACH. To the English adj. correspond OHG. wal(a)hisc, walesc (MHG. walh-, wälhisch, walsch, etc., G. wälsch, welsch), Roman, Italian, French, Du. waalsch Walloon, ON. valskr Gaulish, French (MSw. valskr; Sw. välsk, Da. vælsk Italian, French, southern); cf. the note to WALSHNUT.
In OE. the final h of the stem normally disappeared before the adjectival ending. The West Saxon type *Wielisc (from Wealh) did not survive beyond the OE. period; the two Anglian and Kentish types (from Walh) existed concurrently till the 16th cent., after which Welsh became the sole form in general use, Walsh remaining only as a surname. (The AF. Waleis, which is rarely employed in ME., also survives in the surname Wallace.)

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