After a word ending with varga but not meaning a 'letter or word' the affixes yat and kha are optionally used in the sense of 'who stays there'.,
As वासुदेववर्ग्यः (by यत्), वासुदेववर्गीणः, (by ख), and वासुदेववर्गीयः (by छ) ॥ युधिष्ठिरवर्ग्यः वर्गीणः or वर्गीयः ॥
Of course, when the word means 'शब्द' it takes one affix only; i. e. छ; as कवर्गीय वर्णः 'a letter belonging to क class'.,