Medieval Breton Origin Surnames

This is a list of surnames in which the origin is Medieval Breton. Breton is a Celtic language spoken in Brittany in northwest France.
usage
origin
Harvey English
From the Breton given name Haerviu (see Harvey).
Joossens Flemish
Means "son of Joos".
Joosten Dutch
Derived from the given name Joost.
Joyce English, Irish
From the given name Joyce.