प्रारब्ध (Sanskrit) comes from Sanskrit त, from Sanskrit स्तृ, from Proto-Indo-Iranian Hstā́, from Proto-Indo-European h₂stḗr, from Proto-Indo-European h₂eHs- — to be/become dry; to burn, to glow; hearth.
Ancestry of “प्रारब्ध”, step by step
प्रारब्ध traces back through two separate lines of ancestry.