Reconstruction:Proto-West Germanic/twai-

Etymology
From.

Numeral

 * 1)  two

Inflection

 * Masculine nominative/accusative: *twajVn-, *twainV-
 * Feminine nominative/accusative: *twā?
 * Neuter nominative/accusative: *twai
 * Genitive: *twaijō
 * Dative/instrumental: *twaimi