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There are many nations who are speaking different languages from their ancestors - for example irish or scots were speaking different language in ancient times, but even though they are speaking germanic language nobody calls them germans... but they are presumably called celtic, though they are not using celtic nowadays. On the other hand there are similar nations within uralic linguasphere when in not so ancient times they gradually changed their language use to uralic. One of these are magyars, for example, or there is an example of bulgars who settled among slavic peoples in modern bulgaria and lost their language, but retained name.
Burtas actually are really suspicious because of their name. Also according to wiki in russian they were living from Volgograd to Samara - this is hardly finno-ugric or even uralic territory, but definitelly that was scythians territory e.g. they roamed across the steppe and also this is territory of scythan crop-grower culture - contrary to finno-ugric culture, that came to the Europe from arctic circle and they had hunter-gatherer culture as a basis. Burtas might be a part of nowadays mordvian ancestry - and mordvians nowadays are finno-ugric, but that doesn't mean, that all their ancestors were finno-ugric as well.
