First found in Lothian, where they held a family seat from early times.

Scottish settlers arrived in many of the communities that became the backbones of the United States and Canada. Many stayed, but some headed west for the endless open country of the prairies. In the American War of Independence, many Scots who remained loyal to England re-settled in Canada as United Empire Loyalists. Scots across North America were able to recover much of their lost heritage in the 20th century as clan societies and highland games sprang up across North America. Early immigration and passenger lists have documented some of the first Gilliess to arrive on North American shores: Annette Gillis landed in New York in 1662; Elin Gillis settled in Virginia in 1649; Sarah Gillis settled in New Jersey in 1773; Ann Gillies settled in Pennsylvania in 1773.

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