To investigate the Gevert family, Jussi Gävert and I have started a DNA project. What does that mean?
Gevert is probably the largest blacksmith family in Sweden and most of the family lines are considered to originate from Anders who was active at Forsmark's mill 1627-1632. Anders is believed to have come from Flanders (Belgium) but we do not know anything about his origins there.
To get a better picture of how the family lines are actually connected (not everything is clear), you can DNA test living descendants. The Y chromosome is inherited from father to son to grandson, and since it is consistent with how the family name is generally inherited, testing for Y-DNA is a suitable method. If as many men as possible from different branches of the family test themselves, then by comparing the results we can draw conclusions about the relationship and map the family.
One thing we already know is that some descendants of Anders belong to haplogroup I1-L1302 while others belong to a subgroup of R1b. These two branches are thus not genetically linked to each other.
The DNA project can be found here:
https://www.familytreedna.com/groups/gevert
If you or someone close to you belongs to the Gevert family and has an unbroken father-grandfather-great-grandfather line back to the early Gevert men, we would like you to order a DNA test. The easiest way to do this is with this link to get a project discount:
https://www.familytreedna.com/group-join.aspx?group=Gevert&code=M19997
It is best to start with a Y-DNA37 test which can then be refined if there is a need. The actual sampling is done with a stick that is scraped on the inside of the cheek for half a minute. The sample is placed in a test tube and mailed to a lab. You can see the results by logging into your account at FamilyTreeDNA after a month or two.
Get in touch if you have any questions. I am happy to explain more and give advice on what fits best. General information about DNA testing can be found on SSGG's website, http://ssgg.se/.
Jakob Norstedt
SSGG, Swedish Society for Genetic Genealogy
E-mail: jakob@hoijen.se
English (UK) 
Svenska