From Wiktionary, the free dictionary
Y- (male name prefix) + French Isaac. Compare Vietnamese Y-sác.
Y-Isăk
- (biblical, Protestantism) Isaac
2015, “Klei Mphŭn Dơ̆ng 25 [Genesis 25]”, in Klei Aê Diê Blŭ [The Words of God]:Y-Isăk khăp kơ Y-Êsâo kyuadah ñu ƀơ̆ng čĭm hlô gơ̆, ƀiădah H'Rêƀêka khăp kơ Y-Yakôp.- Isaac loved Esau for he liked the taste of game meat, but Rebecca loved Jacob.