Words and Proper Names

-(a)is (2 sg.)

898.
McGonagle (Noel): Migration of verbal terminations.
In Ériu 37 (1986), pp. 93–97.
On the analogical spread of certain verbal endings, some of which gain independent pronominal status, e.g. -(e)as (1 sg.); -(a)is, -(a)inns, -(a)ir, -, -f(a)í (2 sg.); (-)mar, -(e)amuid, -muis(t) (1 pl.); (-)dar, -(a)id, -dís(t) (3 pl.); -f(e)á, -tf(a)í (impers.); -f(e)ar, -(e)adh, -(e)as (impers.) with irregular verbs; -t(e)ars, -th(e)ars, -f(e)ars (impers.).