Last name Mercieca (Mercieca 
) , across the world, is quite a rare cognomen. The family name Mercieca is habitual in Malta, where it is a widespread surname, Australia, where it is quite a rare surname, and New Zealand, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Malta, Australia, and France.
| VARIANT | COUNTRY |
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| Mercieca | Malta, United Kingdom, France, United States, Australia |
| arturo mercieca Maltese judge, MT (b. 1878) |
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joseph mercieca Maltese prelate, MT (b. 1928) |
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| silvio mercieca (b. 1888) |
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jennifer mercieca American academic, US |
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| paul mercieca French politician, FR (b. 1932) |
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| liam mercieca researcher (ORCID 0000-0002-4255-4517) |
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| tamra mercieca Australian life coach, AU (b. 1980) |
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| grazio mercieca Maltese judge |
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| daniel mercieca researcher (ORCID 0000-0003-4587-6367) |
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| emily-clare mercieca researcher |
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| michael mercieca (b. 1991) |
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