Utsunomiya Daimyojin Shrine

Japanese: 宇都宮大明神 - うつのみやだいみょうじん

...The water turned red from the blood that flowed, hence the name Akanuma, the mountain Akagiyama, and the hot springs at the foot of the mountain Akahisoneyu, and the name Utsunomiya came from the fact that it was the place where he defeated his enemy. Ono no Sarumaru was later worshiped as Utsunomiya Daimyojin. This type of legend was likely born from the group of priests who worshipped Sarumaru and flaunted their origins and spread it around. ...

From [Futarasan Shrine]

…The official name is Utsunomiya Futaarayama Shrine. Formerly known as Utsunomiya Daimyojin. It enshrines Toyokiirihiko, Omononushi, and Kotoshironushi. …

*Some of the terminology that refers to "Utsunomiya Daimyojin" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…血が流れて水が赤くなったので赤沼，山を赤木山，麓の温泉を赤比曾湯と呼び，敵を討った場所であるため宇都宮という名ができたという。小野猿麻呂はのちに宇都宮大明神と崇められたという。この種の伝承は，猿丸を奉じた神職集団が，みずからの出自を誇示し伝播するところに生まれたものであろう。…