Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
PAM
As described in historical dictionaries
Patronymica Britannica (1860)
PAM. The name of one RIc. Pam occurs in H.R. An Austrian family of this name became naturalized here in the last century. PAISIPHTLON. From pampilion a coat of various colours, formerly worn by domestic servants. The word was most Ukely a corruption of the Fr.papillm, abuttei-fly, the gaudy hues of which were emulated by this motley costume. PAMPLIN. The same as Pamphilou.