Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
PAKENHAM
As described in historical dictionaries
Patronymica Britannica (1860)
PAKENHAM. Lord Longford's family are traced to William de Pakenham of Pakenham, co. Suftblk, temp. Edward I.