My answer here shows the Japanese name for Eevee is Eievui, According to Serebii and Bulbapedia. But here on this site it says the Japanese name is Ibui. So i'm wondering is there was possibly a mistake, or whatnot? Maybe it did change and i'm looking at outdated Serebii and Bulbapedia pages.
The B/W page for Eevee on Serebii says the Japanese name is Eievui.