Hi, I've just see you edits.

Where did you find the english name for "곰도" ("곰섬") https://www.openstreetmap.org/way/16380436 ?

The US NGA (National Geospatial-Intelligence Agency) absolutely don't use this one : https://www.geonames.org/1867345/kom-do.html (nor the old map from the US Army Map Service : https://maps.lib.utexas.edu/maps/ams/korea_50k/txu-pclmaps-oclc-6612107-sonam-dong-6132-4.jpg, which use "Ung-do").

Did you speak korean ? Did you master romanization ? (McCune-Reischauer Romanization, Revised Romanization of Korean, Yale Romanization, or better Romanization of Korean ?)

Thanks in advance for you answers