Sword singers basically make a sword out of magica. They don't summon it, like a bound weapon, but rather pull it from their soul.
Ansei is ja group of people who are capable of this.
The Redguards have several gods of war, and they are described as "unkown." I'd assume that Hunding is one of them.
At the risk of being a nitpicky bastard, Hunding is a surname which belonged to an old Yokudan named Frandar, who was said to be the greatest of the sword singers, and his son Divad, the man who became the architect of the Yokudan exodus to Tamriel. HoonDing is a Redguard spirit/god/messiah which materializes in dual corporeal forms, the crown and the sword, during times when the descendants of the Yokudan people are in great need. Examples of the physical manifestation of the HoonDing are (as I recall) Frandar Hunding (sword)/Divad Hunding (crown), Someone (crown?)/Diagna (sword)?, and A'tor (crown)/Cyrus (sword).
As for actual gods of war, who knows. Redguard religion is insanely complicated in its simplicity and rather undeveloped, at least in comparison with the Eight and One, and the Daedra.
Also, I was always under the impression that sword singer was just a literal translation of Ansei.
its all build up for the third ES; adventure game: Cyrus returns to Yokuda.
I wish.
IIRC, the third TES Adventure game had Cyrus going after the Eye of Argonia.