Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
LONGVAL
As described in historical dictionaries
Patronymica Britannica (1860)
LONGVAL. Fr. loiig, and obs. val, the long vale or valley — a local surname common in France, and corrupted among us to Loogvale, Longwall, Lougwell, &c.