Hi there,

Are you sure these names and spellings are still being used?

Take for instance 'Blaen-uaun' - 'uaun' isn't a spelling you'd see very often these days
https://www.openstreetmap.org/way/1334523768
plus the OS OpenData/OpenMap layers show the more modern 'Blaenwaun'

OSM is for mapping modern day features as they are now - for things like this I would recommend OpenHistoricalMap where you can map with time.

Cofion
Ceirios