The story
- Proto-Germanic · derived from*meusą“moss, moor”
- Proto-Germanic · inherited from*miusijō“swamp, bog”
- Proto-West Germanic · inherited from*miusiju
- Old English · inherited from*mȳsiġ
- Middle English · inherited frommisy“swamp, bog”
- English todaymizzy
From Middle English misy (“swamp, bog”), of uncertain origin. Possibly from Old English *mȳsiġ, *mīesiġ, from Proto-West Germanic *miusiju, from Proto-Germanic *miusijō (“swamp, bog”, literally “mossy place”), from Proto-Germanic *meusą (“moss, moor”), related to Old Norse mýrr (“swamp, bog, moor”, whence the English doublet mire), Middle English mes, mease, mise, mese (“moss”), from Old English mēos (“moss”). Compare also dialectal English mizzick, mizzack, mezzack, mizuk, perhaps the same word with a suffix akin to -ock.
Etymology from Wiktionary, CC BY-SA 4.0.