Treasa Treasa Baby Names Irish Treasa Girl 6 letters Pronounce Irish Strong. Treasa is a girl’s name of Irish origin. Meaning in Irish: Strong. The name has 6 letters. Related names Toryn Boy Irish Chief. Traigh Boy Irish Strand. Treabhar Boy Irish Prudent. Treacy Boy Irish Fighter. Treasach Boy Irish Fighter. Treasigh Boy Irish Fighter. Treise Girl Irish Strong. Trevor Boy Celtic Irish Welsh Wise. Prudent. Large village; goodly town. Previous Treadway Next Treasach