In the same books that describe Eilistraee, The Dark Maiden, as shown in the first answer, there is also her older twin brother
Chaotic Evil Drow deity.
Sword Coast Adventure Guide only drops a single sentence on him:
Selvetarm is god of warriors, and therefore patron of male drow, although perhaps not so much as Vhaeraun, the rogue god of thievery and of drow males who rebel against the matriarchy.
Demihuman Deities, on the other hand, describes him in greater detail, as a deity that wants to replace both Lolth and Corellon (his parents) on top of then-joined Elven-Drow pantheon.
Vhaeraun (Vay-RAWN) is the god of thievery and the furthering of drow aims, interests, and power in the Night Above, as the surface world is known to the faithful. He is also the god of drow males opposed to the matriarchy of Lolth, teaching that males are as skilled and valuable as females, and thus passively opposing the teachings of Lolth's priesthood on this point. He believes that drow should work with the other elven races for common advancement and never associate or trade with duergar, svirfneblin, or other dwarven and gnome races. (Humans and halflings can be tolerated.)
Dogma: The shadows of the Masked Lord must cast off the tyranny of the Spider Queen and forcibly reclaim their birthright and rightful place in the Night Above. The existing drow matri-rchies must be smashed, and the warring practices of twisted Lolth done away with so that the drow are welded into a united people, not a squabbling gaggle of rival Houses, clans, and aims. Vhaeraun will lead his followers into a society where the Ilythiiri once again reign supreme over the other, lesser races,and there is equality between males and females.
Most recent details on him and his siblings are in the Mordenkainen's Tome of Foes, but I do not have access to this book.