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What is the origin of the name? Sounds pretty hard to remember

Replying here because I couldn't reply to your other comment (I think it reached max depth).

It has no particular relation to PDFs :D. It's just a random name. I also like the number 31.

It means 31 (thirty one) in persian.

And what connects 31 to PDFs? Just curious honestly. I also wonder why Sumatra is called that way