Here, was named is correct. (here assuming other mountains remain to be named). Not all past forms without a specific time mentioned have to be in the present perfect; however, you don't use a specific time when you use it.
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?????? ????????I mean, don't we use the Present Perfect for an acton we don't say when happened in the past? If so, why the Past SImple is correct for this sentence?.........TENSE >>>...........Simple Past...........Present Perfect