Thread:Esmorax/@comment-26391060-20140507160902/@comment-6697950-20140507162026

As C9 said, both ū and uu are technically correct, as both express a long vowel, it's just a matter of preference. Though page names are always written using double vowels just to ensure that the page is easy enough to find using the search function (because inserting characters like ū is annoying with an English keyboard and most readers probably wouldn't bother using a more complex way of inserting it) and if there are officially confirmed romanisations (like Yuuki for Konno Yuuki), then we use them.