limnonym

From limno- +‎ -onym.

limnonym (plural limnonyms)

1. (very rare) The toponym of a lake.
   • 2015, Tom Eriksson, Juha Janhunen, “On the limnonyms Khövsgöl and Kosogol and their ethnic implications”, in Studia Etymologica Cracoviensia, number 2, page 89:

     Importantly, however, the final *b in *sub 'water' is represented as (*)g [ɣ] in all the Turkic languages of the region, which is why it is unlikely that the Mongolian shape of the limnonym could derive from these languages […]