First found in Bavaria, where this surname surfaced in mediaeval times as one of the notable families of the region. From the 13th century onwards the name was associated with the great social and economic evolution which made this territory a landmark contributor to the development of the nation.

Thousands of German settlers came to North America between the mid-17th and mid-20th centuries. The hardships of the long voyage were balanced by the opportunity to escape poverty and religious persecution. The descendents of these settlers still populate the states of Pennsylvania, Texas, New York, Illinois, and California. Many also live in Ontario and the prairie provinces of Canada. An inquiry into the early roots of North American families has revealed a number of immigrants bearing the name Thomas or a variant listed above: Matheus Thomas, who sailed for America in 1709 with his wife and daughters. Heinrich Thomas also came in 1709; settling in Carolina of Pennsylvania. Johann Philip Thoma came to Philadelphia in 1764.

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