Last name Killackey (Killackey 
) , worldwide, is a rare cognomen. The cognomen Killackey is habitual in Ireland, where it is a rare surname, Australia, and Canada, where it is a very rare surname. Not in comparison with a country's population, it is commonest in the United States, Ireland, and Canada.
| VARIANT | COUNTRY |
|---|---|
| Killackey | United Kingdom, Australia, Ireland, United States, Canada |
| joseph killackey United States Navy Medal of Honor recipient (1879-1946), IE (b. 1879) |
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| samuel a killackey researcher (ORCID 0000-0002-0622-9987) |
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| mary t killackey researcher |
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| tieghan killackey researcher (ORCID 0000-0003-2941-4058) |
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| e. killackey researcher |
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| eóin killackey researcher |
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| eoin killackey |
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