Hetsukaibera (辺津甲斐弁羅神 – Shoreside Tide Lad) was the last of 12 Shinto Spirits born from Izanagi removing items from his body after wanting to wash and cleanse himself after visiting Yomi. This Spirit was formed from the armband on his right arm alongside Hezakaru and Hetsunagisabiko. This is all related in the Kojiki.1
They are not mentioned in the Nihongi.
1. Yasumaro. O, translated by Gustav Heldt. (2014) “Kojiki. An Account of Ancient Matters”. New York: Columbia University Press.
Check out Japan Archives, our Japanese History Podcast