So, I've read the information on the Fatal Frame wiki, and BLC zero wiki about this game as I sooo want to buy it when it comes out but something's been bugging me. On both of those sites, it's been said the English translation of Hikamiyama is "the mountain of the sun god" but I don't think that's correct. The kanji for Hikamiyama is 日上山 the first one is for sun and the last one is for mountain but the middle one, while it is pronounced the same as "kami" which means God, it doesn't actually mean God but can instead mean "top" or "upper reaches of a river or stream".
So, wouldn't the actual correct meaning be along the lines of "the sun at the river source atop the mountain"? (Kinda cumbersome I know - but I was never good at translation).
Still it does fit better than the sun god thing, as if I'm remembering correctly *SPOILER ALERT* at the top of the mountain is the eternal sunset which shines upon the black lake - the spring or source of the water that pours from the mountain.