Sorry it took a while to get back to you. I've been engrossed doing some local research. What I've been able to uncover was that the sept was forced from their land and fled to Ireland. I suppose that you have been to the MacLean sight but I'll forward this just in case. It is quite interesting.
I'm still living in PA @ the following address: 1954 Kendale Place, Lancaster, PA 17601.
I've also read on the forum that Alexanders' father was Andrew Rankine and mother was Agnes Reid but I've yet to validate this.
I'm also trying to validate that Adam and wife Elizabeth May had a son Henry born about 1722.
Best to you.
Septs of Clan MacLean: Rankin
The Rankins are named for Raingce, Gillean's ggggreat grandfather, and are said to be his descendants. This would make them cousins to the MacLeans. The families in Coll were hereditary pipers to MacLean of Duart, and the MacLeans of Coll. They are apparently not connected with the Lowland family of the same name. There is also a family of Rankins from Glencoe, which may or may not be connected
Underlined names are linked to the database index.
Click on them to find persons with that name in the database.
Rankin, Rankine, Rankeine, Rankein, Ranken, Rankene, Rankan,
Rankyn, Rankyne, Rankeyne, Raing, Ranking, Rankinge, Rankini, Raincin,
Rankinson, Rankynson, Rankesoun,
MacRankin, MacRankein, MacRankyne,
McRankin, McRankein, McRankyne,
M'Rankin, M'Rankein, M'Rankyne,
MacRaing, MacRanking, McKrenkine
From Raingce, an old Gealic personal name,
From MacFhraing, Gaelic for "Son of Francis"
The following are quotes from
The Surnames of Scotland:
Their Origin, Meaning, and History
By George F. Black, Ph.D.
New York, New York Public Library; 1946
(1) 'son of Rankin or RANKEN,' q.v. Once a common surname in Ayrshire. Henry M'Rankyne in Glengirvane by Mayboll was a charter witness in Carrick, 1563 (RMS., III, 1421). Neil M'Rankyne in Glengovane, a tenant under Kennedy of Culzeane in 1608 appears in 1610 as Neil Ranking or M'Ranking of Blairquhan (RPC., VIII, p. 426, 671). Margaret M'Rankein in Pynblaid, her father, 1621 (Retours, Ayr, 199), and William M'Krenkine subscribed to the Test in Edinburgh, 1681 (RPC., 3. ser. VII, p. 724).
(2) A once common name in Glencoe and neighborhood. G. MacFhraing, 'son of Francis.' This origin is supported by the old Ranoch form in the name of John Oig Mac Frankeine, 'servitor to the Clandoindouey Vc Alester' in Dounane, who was charged with illegally carrying arms, 1618 (RPC., 2. ser. VII, p. 372). Duncan M'Donchie VcCrankine in Glencoe was one of several to be apprenended for the murder of Duncan and James Stewart, 1617 (ibid., p. 187). Duncan McCraing in Nether Lorn, 1692 (Commons p. 34). The Rankins or MacRankins of Coll were hereditary pipers to Macleans of Duart, and later to Macleans of Coll. They were earlier known as Clan Duille, from Cuduilligh. They had a 'college' ar Kilbrennan, Mull, and the last 'professor' was Eoghan Mac Eachain 'ic Chonduiligh, who died c. 1754. They have no connection with Lowland Rankins. The resemblance of the name Rankin with old Gaelic Raingce of 1100-50 is most probably fortuitous.
RANKIN, RANKINE. A pet form of some name like Randolph with diminutive -kin added. The Irish have it as Raincin. The early home of the Rankins was in Ayrshire, where persons of the name were small proprietors before the end of the sixteenth century (Stodart, II, p. 369). John Rankyne, burgess of Glasgow, 1456 (REG., 380), may be John Rankin or Rankyn whose land is mentioned in 1468 (LCD., p. 181, 254). Peter Rankyne of Scheild appears in 1496 (Bucc. MSS.), and was witness in Kilmarnock, 1504 (Bain. IV, 1737). William Rankin is mentioned in connection with Innerkethin, 1500 (RAA., II, p. 404). Dominus Johannes Rankyn, chaplain, witness in Glasgow, 1503 (RMS., II, 2723; REG., p. 506), may be Schir John Rankin, vicar of Girwane, 1504 (Trials, I, p. *43). John Rankyn was rector of Hutoune, 1507; another John Rankin was tenant under the bishop of Aberdeen, 1511 (REA., I, p. 363); a third John Rankyn had a house in Irvine, 1533 (Irvine, I, p. 39); and still another John Rankin, a follower of the earl of Cassilis, was respited for murder, 1526 (RSS., I, 3386). Elspet Rankeyne is recorded in Aberdeen, 1570 (CRA., p. 270), John Rinking appears as witness in Glasgow, 1587 (Protocols, X), and William Rankine was a notary in Ayr, 1590 (Ayr, p. 116). As a forename we have it as early as 1429 , when Rankin de Fowlartoun is in record in Ayr (Ayr, p. 83), Rankin de Craufurd and Rankin Small in Prestwick, 1446 (Prestwick, p. 144), Rankine de Symontone in Irvine, 1477 (Irvine, I, p. 149), Rankinus Salmone in Glasgow, 1504 (Simon, 111), and Rankyne Davidsoun, reidare at Gawstoun (Galston), 1574 (RMR.). In the records of the Scots Guards in France we have Ranequin Kennedy. Rankein 1678, Rankeine 1638, Rankene 1599, Rankinge 1555; Ranking, Rankini, Renkyn.