MACTAVISH is the modern spelling of this clan’s name. Originally it had many forms, chief of which were Thompson, Thomason, MacOmish and MacCombie derived from MacTommie, and MacThamais or MacTavish, from the Scots Tammas. In Perthshire, as early as 1488, Donald MacCause (another form of the name) obtained lands near Killin, where he died in 1491. Many of the Argyllshire MacTavishes have changed their name to Thompson. This family claim to be a sept of the Clan Campbell, descended from a son of Colin, the third Campbell, from whom are descended Clan Tavish Campbell. MacTavish of Dunardy was Chief of the clan.