The accompanying text in 'The Clans of the Scottish Highlands' by James Logan begins as follows: "SIOL NEACHDANN, OR MAC NACHTANS This tribe may yeild to few others in the antiquity of its name. Tradition derives this clan from Nachtan, a hero in the reign of Malcolm IV, who succeeded to the crown in 1153, but it is believed that they were long previously a powerful tribe in the province of Moray. The name is identic [sic] with the Pictish Nectan, celebrated in the regal chronicle of that nation, one of the great Celtic divisions in Scotland, and the appellation is among the most ancient in the north of Ireland, the former seat of the Cruthen Picts."
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