Cognomen Syvälahti (Syvälahti 
) , all around the world, is a very rare surname. The surname Syvälahti is habitual in Northern Europe, particularly Finland, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Syvälahti | Finland |
| piritta eerikintytär of syvälahti, heiress of syvälahti manor - Abt 1580 |
|