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208 gorwyẟawt 36 ‘horses’, sg. gorw͡yẟ; eẟystrawt 70 ‘horses’ sg. eddystr or eddestr. The first survives as pysgod, in which the ending is now indistinguishable from old ‑od.

‑i̯aid, Ml. W. ‑ẏeit, ‑eit, is the pl. formed by affection of the ending ‑i̯ad, Ml. W. ‑ẏat § 143 iv (5); thus offeiriad ‘priest’ pl. offeiriaid, Ml. W. offeireit Ỻ.A. 117. All names of living things in ‑i̯ad (except cariad) form their pl. so; thus ceinẏeid i 285 ‘singers’, lleitẏeid (t ≡ ẟ) ib. now lleiddiaid ‘murderers’, gleissẏeid ib., now gleisiaid, sg. gleisiad ‘salmon’; but abstract nouns in ‑iad have ‑iadau § 120 i (4); cariad ‘lover’ is the same as cariad ‘love’ and has pl. cariadau Hos. ii 5, 7, 10.

But ‑iaid is also added to form the pl. of names of living things whose sg. does not end in ‑iad:

Names of classes and descriptions of persons: personnẏeit Ỻ.A. 117, now personiaid, sg. person ‘parson’; conffessorieit do. 70; r͑aclovẏeit 456, Mn. W. rhaglofiaid, sg. rhaglaw ‘deputy’; barwnẏeit 179, now barwniaid, sg. barwn ‘baron’; makwyveit 15, mackwyeit  9, sg. maccwy(f) ‘youth’; bẏleẏnẏeẏt i 24, sg. bilaen 123 ‘villain’; cythreulẏeit  i 251b ‘devils’; ysgwierẏeit  11 ‘squires’; in Mn. W. pennaethiaid Ps. ii 2, sg. pennaeth; estroniaid ‘strangers’, meistraid ‘masters’, gefeilliaid ‘twins’, Protestaniaid, Methodistiaid, etc. Also adjectives used as nouns, § 145 iii.

Tribal and national names: Albanẏeit 271, also Albanwyr do. 270, sg. Albanwr ‘Scotchman’; Corannyeit 96, no sg.; Brytanẏeit do. 91, no sg.; y Groecieit a’r Lhadinieit J.D.R. [xiv] ‘the Greeks and Latins’; Rhufeiniaid, Corinthiaid, etc. Also family and personal names: y Llwydiaid ‘the Lloyds’, y Lleisioniaid L.G.C. 110 ‘the Leyshons’, Koytmoriaid 61/33.

All names in ‑ur of living things: pechadurẏeit Ỻ.A. 152 now pechaduriaid, sg. pechadur ‘sinner’; kreadurẏeit do. 4, now creaduriaid, sg. creadur ‘creature’; awdurieid J.D.R. [xiv], awdurẏeit 1375, sg. awdur ib. ‘author’ (the pl. awduron seems to come from the gorseddic writings, the source of numerous fabrications); Mn.W. ffoäduriaid, cysgaduriaid, henuriaid, etc.