Lethyn 1165 x 1172 St A. Lib. 179
Lethin 1165 x 1172 RRS ii no. 13 [= St A. Lib. 217]
Lethim c.1220 Terrier C [17/18th c. copy; St Andrews Priory land; part of the Boar’s Raik]
Priourislethin 1452 x 1480 RMS ii no. 1444 [St Andrews Church land]
Priourelethin 1471 RMS ii no. 1039
(David Orme of) Priourlethame 1571 RMS iv no. 2105
Prior Lathyne 1587 Assumption, 10 [St Andrews Priory, feued for £13 6s. 8d.]
Prior Lethem 1592 APS iii, p. 549, c. 20
Priourletham 1593 RMS v no. 2273 [St Andrews Priory land]
terras de Pryorlethan 1625 Retours (Fife) no. 364
Pryorlathon 1642 Gordon MS Fife
Pryerlethane 1645 APS vi (part i), 332 [part of newly formed CMN]
Pryor-Lathon 1654 Blaeu (Gordon) Fife
Prior Lathim 1684 Adair/East Fife
? Trylethem 1753 Roy sheet 19, 5
Prior Lethem 1775 Ainslie/Fife
Prior Letham 1855 OS 6 inch 1st edn
Sc prior + en Letham
The specific is from Sc prior, referring to the head of the Augustinian priory of St Andrews, in whose possession the lands of Priorletham remained throughout the middle ages. This specific distinguished it from the neighbouring Lambieletham, which the canons of St Andrews Priory gave to the Culdees of St Andrews in exchange for part of Strathkinness SSL, some time between 1156 and 1159 or 1160 (see *Balmartin SSL and Kininnis # CMN).
It is one of a list of lands, all described as being beside St Andrews, which Maolsneachda had held from Bishop Richard of St Andrews, and which the bishop granted to St Andrews Priory between 1165 and 1172 (St A. Lib. 179). For a full list of these lands see Bassaguard SSL. The Lethyn in this list must refer specifically to Priorletham, as by this time Lambieletham was already in the possession of the Culdees.
OS Pathf. also shows Priorletham Smithy.
This place-name appeared in printed volume 3