Last name Ojonen (Ojonen 
) , globally, is a very rare cognomen. The last name Ojonen is characteristic of Northern Europe, particularly Finland, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ojonen | Finland |
| unto ojonen Finnish architect (1909–1997), FI (b. 1909) |
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| pekka ojonen Finnish architect, FI (b. 1932) |
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