sacca (Pali) comes from Sanskrit सत्य, from Proto-Indo-Aryan Hsatyám, from Proto-Indo-Iranian Hsatyás, from Proto-Indo-European h₁s-n̥t-yós, from Proto-Indo-European h₁sónts, from Proto-Indo-European h₁ēs- — to be.
sacca (Pali): truth; true; real