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The extant Zwerdling lineages all appear to descend from the sons of Tobias Zwerdling (b. 1781; d. 30 August 1855, Brody).
Y-DNA E-M35
Y-DNA matching suggests the Zwerdling line goes back to Brody-Tarnopol about 1760 and by 1700 is from West Germany or the Netherlands.
Feel free to get in touch if you have any connection to this family.