[Tagging] When should a name:* translation be used?

[Nathan Edgars II]

I ask because someone added a name:vi tag for Orange County, Florida: 
http://www.openstreetmap.org/browse/relation/389011
As far as I know, there is no large Vietnamese population here and no 
other reason why someone would want to know the literal translation of 
Orange County into Vietnamese.

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