Probably borrowed from a substrate language. *<span class="searchmatch">suońō</span> wet bog Western <span class="searchmatch">Samic</span>: Northern Sami: suotnju Eastern <span class="searchmatch">Samic</span>: Inari Sami: suánju Skolt Sami: suânnj Kildin...
*soygw-ó-/*soygw-í-. The word could be in some relationship to Proto-<span class="searchmatch">Samic</span> *<span class="searchmatch">suońō</span> (“swamp”), yet here the contraction to a monosyllable would be irregular...