The affix yus (yu) comes in the sense of matup after the word aham and the indeclinable śubham 'good'.,
Thus अहंयुः = अहंकारवान्, 'selfish haughty', शुभंयुः = कल्याणवान् ॥ 'auspicious'. The स् of युस् makes the words अहम् and शुभम्, Padas; and म् is changed into Anusvara 1.4.16; 8.3.23. See 5.2.123.,