EFA Commander, John Thor Ewing, has published another book -- the new edition of R. S. T. MacEwen's volume from 1904 titled, "Clan Ewen: Some Records of its History," which is now available via Amazon.
(https://www.amazon.com/Clan-Ewen-Records-Facsimile-Commentary/dp/1910075043/tag=thoewi-21)
This edition includes copious notes from Thor, which are somewhat longer than MacEwen's original text and often contradict many of his assumptions. Thor points us directly to Clan Ewen of Otter as the founder clan/family of Clan Ewing.”