Transferred use of the Welsh surname, in origin a local name from any of the many places in Wales called Trefor, from tref ‘settlement’ + fôr, mutated form of mawr ‘large’. In the mid-20th century it came to enjoy considerable popularity in the English-speaking world among people with no connection with Wales; for example the actor Trevor Howard (1916–88) was born in Kent.
English: occupational name for a hunter or a huntsman's servant. The second element is Middle English man ‘man’, ‘servant’, while the first is either from Old English hunta ‘hunter’ or Middle English hunte ‘a hunt’. In some cases it is probably from an unattested Old English personal name, Huntmann (a compound of hunta ‘hunter’ + mann ‘man’).