Last name Rajasalu (Rajasalu 
) , throughout the world, is a rare cognomen. The surname Rajasalu is habitual in Estonia, where it is quite a rare surname, Finland, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Rajasalu | United States, Estonia, Finland |
| inda rajasalu Estonian historian, EE (b. 1938) |
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| teet rajasalu Estonian economist, EE (b. 1941) |
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| ülle rajasalu Estonian politician, EE (b. 1953) |
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| tarvo rajasalu Estonian medical researcher, EE (b. 1969) |
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| triinu rajasalu Estonian diplomat, EE (b. 1974) |
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| aleksander rajasalu |
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