Fairies are the common name for male fairies. There is no difference in gender. However, there are dozens of distinct types of fairies, some of which are predominately or solely male, according to mythology.
One form of fairy that is only referred to as male is the leprechaun, or clurichaun, linked with drinking and the pot of gold. Red men, or fear dearg, are connected to gory jokes and nightmares, and a male fairy resembling them, the redcap, is said to require blood baths to survive.
The brownie is a more benevolent male fairy that works around the house and does tasks in exchange for cream.
Nixies, banshees, and leanan sidhe are just a few of the fairies who are only female.