The Trefor in Gwynedd is believed to have derived from Trevor Jones, manager of the quarry there in the 1850s. The village was formerly called Yr Hendre.

It grew as a result of the development of industry in the area and by 1880 the Welsh Granite Company had established a school there.

There is a Trefor in Anglesey and another near Llangollen.

The spelling as Trefor reflects a standardising of -v- as -f- and a perception that the village name is the same as other examples of Trefor which derive from tref (farmstead, hamlet, village, industrial settlement) and fawr (large).

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Trevor Fishlock meets Trefor Davies and Dawi Griffiths to discuss the place name Trefor.

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