First found in county Galway, where they held a family seat from very ancient times.

The 18th century saw the slow yet steady emigration of Irish Families to British North America and the United States. Those early Irish settlers that left their homeland were typically moderately well off: they were enticed by the promise of a sizable plot of land. However, by the 1840s, this pattern of immigration was gone: immigrants to North America were seeking refuge from the starvation and disease that the Great Potato Famine of that decade brought. The great numbers of Irish that arrived to the United States and the soon to be Canada were instrumental in their quick development as powerful industrial nations. An examination of early immigration and passenger lists uncovered many early immigrants bearing the name Cahill: Elizabeth Cahill, a bonded passenger, who arrived in America in 1735; Thomas Cahill, an "enforced emigrant" sent to America from Ireland in 1737; Daniel Cahill, who arrived at Marblehead, MA in 1768.

Motto Translated: I trust in the Lord.

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