Trevathan is an unusual and distinctive given name of Welsh origin, derived from the name 'Trevaethan', which itself is believed to have evolved from the Old Welsh 'Tref' meaning 'town' or 'settlement', and 'Coethin', a personal name. The use of Trevathan as a first name appears to be relatively recent and not widely prevalent, perhaps reflecting its status as primarily a surname in the past.
Trevathan is quite uncommon; only 5 babies were named Trevathan in total, all born in 2016.