The name Gwen was given to 371 girls born in the US in 2016. More than 99.9 percent of people with the first name Gwen are female.
― Anonymous User 6/7/2017
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Gwen or Gwenn, and also as parts of a name, is shared by thousands of Breton women and men. Brittany's national flag is called the "Gwenn-ha-du" (white and black).
My mother's name is Gwen, and I have a friend whose name is Gwenllian, that we call Gwen. I actually find it to be quite a common name, here in North Wales :)
GWEN is not only of Welsh origin, but also Cornish and Breton. In Breton (Brittany-Europe), it is spelled the same, more often GWENN. It means also the white colour.
Source: https://dmnes.org/name/Gwen