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Topographically speaking, the agreed form is the more likely. There are examples of <nans> to <lann> occuring far more often than the opposite; as early as the 11th C.
birches, birch trees
<nans> valley + <besow> birch trees
Lambedou c.1200 Lambetho 1298 Lanbedou 1302 Lambedou1327 Lambedou 1328 Lambedou 1338 Lambesouwe 1353 Lambesou 1399