পত্ররাজি (Bengali) comes from Bengali পত্র, from Sanskrit पत्त्र, from Proto-Indo-Iranian pátati, from Proto-Indo-European péth₂eti, from Proto-Indo-European peth₂- — to spread out; to fly.
Ancestry of “পত্ররাজি”, step by step
পত্ররাজি traces back through two separate lines of ancestry.