We know very little on how long they have been around but from in game sources (being that there are outside sources), but we know that the goblin scientist claims responsibility for the creation of the gilblin race. One of his many odd and... questionable feats.
Gilgoblins have many similarities to goblins but also many differences. Their skin is blue with tiny dots. Like goblins they have a prominent pointy nose, however the gilgoblin's nose seems to have no nostrils. Their necks have what look to be gills which explains the absence of nostrils. Gilgoblins have fins on ends of their arms, with webbed hands and feet almost certainly for swimming. Their hair resembles seaweed and their ears are practically fins.
This section concerns content exclusive to Cataclysm.
- Their name is a portmanteau of gill and goblin and likely means "gilled goblins".
- Gilblins (a group of hostile gilgoblins led by Gilblingle)
- Hobgoblins (another subspecies of goblins)