our, so Irish and Old Irish *(s)aron; this form may have arisen from unaccented n$$.s-aron (Jub.), like Gothic uns-ar (us of English and ar), German unser, English our (Thurneysen). Stokes refers it to a Celtic (n)ostron, allied to Latin nostrum. See further at bhur.
Etymological dictionary of the Gaelic language.
Alexander Gairm Publications.
1982.