Yaun-Goicoa
Yaun-Goicoa is also known as Jaungoika. Little is known about him, however, there have been linguists that claim Jaungoika is not a Basque name and would be more properly spelled as Goikajaun. I have also seen reference that jaungoika is "god" where Jaungoika would be "God" or the Christian God. Another reference is that Yaun-Goicoa created all of the other gods and goddesses of the Basque pantheon, however, this attribute has also been applied to Mari. If you have more information or stories, I would love to hear about them.