A merchant, met by Lone Wolf in Joe Dever's Lone Wolf 2: Fire on the Water. He is one of the passengers on the coach from Ragadorn to Durenor, which Lone Wolf is forced to flee in Gorn Cove.
In the Legends novels, Halvorc is slain in the fighting which followed Lone Wolf's battle with an assassin.
Sounds like "half-orc", but confusingly, the character is fully human (though a little on the pudgy side). Anyway, there's no Orcs in the Lone Wolf universe.