Family name Loponen (Loponen 
) , in all the world, is quite a rare surname. The last name Loponen is characteristic of Northern Europe, particularly Finland, where it is quite a common surname, Estonia, where it is a rare surname, and Norway, where it is a very rare surname. In absolute terms, this name is the most popular in Finland, Canada, and the United States.
| VARIANT | COUNTRY |
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| Loponen | Norway, Canada, Finland, United States, Estonia |
| aaro loponen Finnish painter, FI (b. 1928) |
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| jouni loponen Finnish ice hockey player, FI (b. 1971) |
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| juho loponen researcher |
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| seppo loponen Finnish translator, FI |
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| jussi loponen researcher |
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| niina loponen researcher (ORCID 0000-0001-9180-9849) |
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| auli loponen FI |
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| marjo loponen FI |
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| kari loponen FI |
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| marika loponen FI |
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| lillian loponen CA |
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| laura loponen Finnish athletics competitor, FI |
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| kalle loponen FI |
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