Rennie Tartan

Tartans for many non-Highland families have been registered in modern times and even many Highland Clan tartans are themselves very recent.

as per www.tartans.scotland.net :
The accreditation list gives the author and weaver, James Scarlett, as the designer in 1980. The tartan register records the designer as Peter MacDonald who worked as a weaver for the Scottish Tartans Society in 1981. Rennies, Rainys and Rainnies (from 'Ranald') are listed as a sept of MacDonell of Keppoch.