I came across a couple of pages from an Internet search from the following publication:
"The Peerage of Ireland: or, A Genealogical History of the Present Nobility of that Kingdom," Vol 1, Oxford University, 1789. On page 248 is a continuing account of the Earls of Westmeath which has a footnote across Thomas, 6th Earl, who married (1) Mary, daughter of Walter Stapleton, and after her death married (2) "...Catherine, daughter of Henry White of Pitchfordstown, in the County of Kildare, Esq." The footnote is quite long and continues on the next page. The first part of the footnote on page 248 reads as follows (please understand the current "s" was "f" at that time. The footnote is transcribed - to the best of my ability in reading the photocopy):
"Richard de Pitche (sic) came into Ireland, according to Giraldus Cambrenfis, in 1170; he was father of Lord Ralph de Pichford, so ftyled in the charter of Matthew, Abbot of Mellefonte, and alfo in a chater of Hugh de Lacie to Maurice Fitz-Gerald, anceftor to the Duke of Leinfter, who died in 1177; he is prefumed to be the father of Richard de Pichford, and alfo of John de Pichford, who was father of Lord Ralph de Pichford, fo ftyled in a charter of Ralph Peppard to the burgeffes of Howtrard, and alfo in the enrollment of the above record, anno 1290. The faid Ralph was father of Thomas, now Whyte, of Pitchfordftown, or Picherftown, who had two fons, John (of Picherftowne, Boyftonne, Whit/tonne, Farranftowne, Kilcock and Branganftowne, as by deed of feoffment, dated 13 December, 1435, 13 Henry VI. and he was father of William Whyte, living in fame year); and James of Trim, who, on his nephew Wil/iam's deceafe, fucceeded at Pitcherftown, as appears by an exemplification of a recovery under fale by James Whyte, againft Edmund Birmingham, in an action of trefpafs for the lands of Pitchfordftowne, tefted 11 January, 1464, 5 Edw. IV...."
This makes me believe Ralph Pitchford was the father of Thomas Whyte, who was the father of sons John (of many towns) and James (of Trem). This is extremely interesting and doesn't seem to show up in any of the common works of the last century and a half. Other works on the Earls (of Westmeath) may provide some additional information that may clarify the Whyte families. This may be why no one can find any Pitchford information in Ireland other than a township name.
Regards,
Eric