Lahti is a Finnish surname meaning "bay" or "gulf".
As of 2014, 65.6% of all known bearers of the surname Lahti were residents of Finland (frequency 1:737), 22.0% of the United States (1:144,270), 7.6% of Sweden (1:11,357) and 2.4% of Canada (1:133,326).
In Finland, the frequency of the surname was higher than national average (1:737) in the following regions: [1]
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