Hi Rupert
In this case I would not translate the name into English although if there is an English name that goes in the name:en tag.
Names such as this are easily availble from the OS OpenData Streetview layer in the iD editor. Making use of these available sources at the time makes far more sense than having to revisit the  edit later.

The name reminds me of the village/hamlet of Pontygwaith which was the other side of the Merthyr valley from my grandmother's. Even though I knew what it meant in English we always referred  to it as Pontygwaith. The houses were demolished in the late 70s to make way the the A470 dual carriagway and all that now remains is the bridge and a farm.

Cheers Phil