As with so many families whose history
stretches back before the twelfth century, the derivation of this
family’s surname is uncertain. If the name is Celtic in its
origin, it may derive from the Gaelic personal name ‘Fear
Sithe’, meaning ‘man of peace’. It may, however,
allude to a place of peace, and refer to a particular place, or
lands. One tradition provides a Norman descent from Forsach, one
of the Norsemen who settled on lands on the River Dordogne in Aquitaine.
The Viscomte de Fronsoc accompanied Eleanor de Provence to London
to marry Henry III and lived at the English court from 1236 to
1246. It is believed that his family obtained lands in Northumberland,
and thence to the Borders of Scotland.
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