The PSP can play original PlayStation 1 games using custom firmware. However, even the first Hitman: Codename 47 was a PC exclusive, so there are no PS1 ports to convert.
While you won't find a direct official port, the "Hitman PSP ISO" keyword often points to fan-made mods, unrelated series with similar names, or alternative stealth titles that deliver a comparable experience on the PPSSPP Emulator. Why You Won't Find an Official "Hitman PSP ISO" hitman psp iso highly compressed
There are several PSP games based on this popular anime (e.g., Battle Arena , Kizuna no Tag Battle ), but these are arena fighters, not stealth games. The PSP can play original PlayStation 1 games