Words and Proper Names

anallain

1567.
Breatnach (R. A.): The formant -in.
In Éigse 16/3 (Samhradh, 1976), pp. 232–234.
On the adverbial suffix -in, e.g. feastain, chuigint, choíchin, thoirin, anallain, ScG mu dhéidhinn, amháin, etc.; suggests -in originated in éicin.