Cognomen Hartikainen (หฤทัย 
, Hartikainen 
, Хартикайнен 
) , globally, is quite a common surname. The cognomen Hartikainen is habitual in Northern Europe, particularly Finland, where it is quite a common surname, Estonia, where it is quite a rare surname, and Sweden. Not in comparison with a country's population, it is commonest in Finland, Sweden, and Thailand. Also, Hartikainen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| หฤทัย | Thailand |
| Hartikainen | Sweden, Estonia, Australia, Finland, Canada |
| Хартикайнен | Russia |
Хартикаинен, and Хартікайнен
| pekka hartikainen FI (b. 1861) |
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johannes hartikainen FI (b. 1912) |
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jani hartikainen footballer, FI (b. 1975) |
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jari hartikainen FI (b. 1967) |
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antti hartikainen Finnish pesäpallo player, FI (b. 1985) |
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teemu hartikainen Finnish ice hockey player, FI (b. 1990) |
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| erkki hartikainen Finnish atheist activist, FI (b. 1942) |
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| helinä hartikainen Finnish professor, FI (b. 1947) |
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| jarmo hartikainen chess player (b. 1963) |
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| johanna hartikainen Finnish screenwriter, FI (b. 1964) |
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| olli hartikainen finnish pesäpallo player, FI (b. 1968) |
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| ari hartikainen FI (b. 1958) |
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| markku hartikainen chess player (b. 1973) |
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| antti hartikainen FI (b. 1963) |
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| torill fonn hartikainen SE (b. 1967) |
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