French: habitational name from any of various places, for
example in Calvados, Loiret, and Oise. The first of these is recorded
in 1180 as Silleium, from the Gallo-Roman personal name
Silius or Cilius + the Latin locative suffix
-acum. The others are from a personal name Sol(l)ius +
-acum.
Southern English: of uncertain origin; possibly a
habitational name imported from France and so identical with 1, or
alternatively a variant of Sulley. It may also be from the
parish of Sully in Glamorgan, Wales, so called either from Old Norse
sul ‘cleft’ + ey ‘island’ or from the Norman family name
de Sulley (as in 1), which is recorded in Glamorgan in the 12th
century.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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