Thanks everyone who replied to my post.
I have proposed to change $wgSitename to "ウィキペディア" in Japanese
Wikipedia. A few users oppose itself. The half of users support
changing not the prefix of project namespace but only site's name, while
others support changes of both $wgSitename and project namespace's prefix.
Leaving the door open to further change, can we set $wgSitename = "ウィ
キペディア" and $wgMetaNamespace = "Wikipedia"?
Sorry for my poor English. Thank you.
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[[w:ja:mizusumashi]]