Some names from 15-17th century Latvia.

https://s-gabriel.org/names/ffride/latvian_bynames.html

workers into Latvians? Ethnicity and transport workers’ guilds in Riga before and after the Reformation" Journal of Baltic Studies 52 (1):61–83. DOI: 10.1080/01629778.2020.1863238

That's everything I could find.
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