I'd say Pötr would be a (technically) correct transcription, although it looks super weird. On pronunciation: “Pyotr” is most close, if you use the “y” just to

I'd say Pötr would be a (technically) correct transcription, although it looks super weird. On pronunciation: “Pyotr” is most close, if you use the “y” just to note that the “p” is soft and not as a separate sound – i. e. “Pjotr” would be incorrect.