Compare Old Persian 𐎱𐎼𐎰𐎺 (Parθava) and Parthian 𐭐𐭓𐭕𐭅 (prtw).
The genuine Middle Persian development is [Term?] (/Pahlaw/).
𐭯𐭫𐭮𐭥𐭡𐭩 • (plswby)