According to the Clwyd/Powys Archaeological Trust, The Doomesday Book referred to the settlement on the site of present day Trelawnyd as Rivelenoit.
A later variation of Riwlyfnoyt was recorded in 1339 which has been translated as the ‘slope of Lēofnoth’.
The Name of Trelawnyd was first documented in 1649 but the village was renamed “Newmarket” in 1610 or 1611 by John Wynne a local landowner who lived at “Y Gop”. Wynne had an idea to develop the village into a prosperous market town. He organised a weekly market, annual fair and built several public buildings including a non-conformist chapel and grammar school. The school, it has been said, was to teach Latin, Greek, French, mathematics and navigation.
In 1954 Newmarket was renamed Trelawnyd, which can be translated as “ A town full of wheat”.