Family name O'Melia (O'Melia 
) , in the entire world, is a rare cognomen. The surname O'Melia is habitual in Ireland, where it is a rare surname, New Zealand, and Canada, where it is a very rare surname. In absolute terms, it most frequently occurs in the United States, the United Kingdom, and Ireland.
| VARIANT | COUNTRY |
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| O'Melia | United Kingdom, Ireland, Canada, Australia, United States |
| kathleen o'melia Christian lay missionnary, GB (b. 1869) |
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| thomas a. o'melia (b. 1898) |
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| charles r. o'melia (b. 1934) |
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| michael o'melia college basketball player (1962–1964) Wisconsin |
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| meghan j o'melia researcher |
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Ms, Dale, Drew, Gina, Lisa, Lucy, Jack, Jake, Josh, John, Jean, Tina, Nate, Nick, Erin, Emma, Eoin, Hugh, Irma, Maria, Megan, Mindy, Ryan, Sarah, Rita, Paul, Jo, Amy, Bob, Pat, Don, Jim, Tom, Tim, Neh, Mary, Mark, Mike, Sean, Skip, Alan, Anna, Anne, Adam, Chad, Bill, Kaci, Robt, and Shawn