Clan Anderson (Scottish Gaelic: Gilleaindreas) adopted its name from Scotland’s patron saint with the meaning “servant of Andrew”. Two divisions have been identified, a Celtic offshoot of Clan Anrias which held territory in northeast Ross-shire and a lowland Scottish branch which is largely represented in Aberdeenshire, Banffshire, and Morayshire. It is probable that the MacAndrews arrived in Petty, Badenoch, from Moidart in around 1400; however, they have spread throughout all of Scotland and to the border regions, notably including David and Duncan fiz Andreu, burgesses of Peebles and Dumfries respectively. The name also occurs early south of the border in Northern England, Rogerus Andreweson appearing in the 1272 Yorkshire poll tax return records.
The maternal lineage of Johannes Karl can be traced back to Clan Donald via Sorely Boy MacDonnell, who established his clan in Antrim, Ireland, in the 16th century; and thus further back to Somerled, the 12th century Norse-Gaelic King of Mann and the Isles, and through him to Harald Hardrada, Harthacnut, Cnut the Great, and the legendary Ragnar Lothbrok.
The more recent ancestral homeland of the Angle-Saxish House of Andreassuun, stretching back to the nineteenth century, is the city of Birmingham, a hub of the Industrial Revolution.