Biography
There are at least two artists using or who have used this name:
1) Margret was used by Minnesota artist Maggie Morrison (of Gayngs and Lookbook) for her 2019 self-titled solo debut.
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2) Montreal based musician Chris Hauer went by Margret between 2011 and 2019, they released 3 albums under the name.
Biography text from Last.fm, available under CC BY-SA.