First found in county Mayo, where they held a family seat from very ancient times. The family can be traced back to the ancient King Niall of the Nine Hostages, who in turn could be traced back to the Heremon Kings.

A great mass of Ireland's native population left the island in the 19th century, seeking relief from various forms of social, religious, and economic discrimination. This Irish exodus was primarily to North America. If the migrants survived the long ocean journey, many unfortunately would find more discrimination in the colonies of British North America and the fledgling United States of America. These newly arrived Irish were, however, wanted as a cheap source of labor for the many large agricultural and industrial projects that were essential to the development of what would become two of the wealthiest nations in the western world. Early immigration and passenger lists indicate many people bearing the Dowda name: the Dowd family who arrived in Virginia as early as 1656. Thomas Dowd began the family trek. Most of the family, however, landed following the Potato Famine and settled in Pennsylvania and Massachusetts in the late 19th century..

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