Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
PLANCHE
As described in historical dictionaries
Patronymica Britannica (1860)
PLANCHE. Probably of Norman origin. There are three places in the province, called Planches-sur Iton, Planches-sur-Rile, aud Planchez-Mellerai, situated respectively in the arroudissements of Louviers, Argentan, and Avranches.