Irish (Antrim) and Scottish (Glasgow): probably a northern Irish variant of Scottish Killoch a habitational name from the village of Killoch in Ayrshire.
Source: Dictionary of American Family Names 2nd edition, 2022
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Where is the Killough family from?
You can see how Killough families moved over time by selecting different census years. The Killough family name was found in the USA, the UK, Canada, and Scotland between 1840 and 1920. The most Killough families were found in USA in 1880. In 1911 there were 19 Killough families living in Ontario. This was about 61% of all the recorded Killough's in Canada. Ontario had the highest population of Killough families in 1911.
Use census records and voter lists to see where families with the Killough surname lived. Within census records, you can often find information like name of household members, ages, birthplaces, residences, and occupations.
Between 1944 and 2004, in the United States, Killough life expectancy was at its lowest point in 1944, and highest in 2000. The average life expectancy for Killough in 1944 was 25, and 72 in 2004.