Jon Trottesson buys 1/8 of Wåkön. The whole Wåkön is set to 1/4 mantal, so Jon buys half of it. To me that indicates that Gumme stands for the other half. The easy explanation is that he is the son of Jöns Hansson, and thus brother of Hans and Jöns younger. That might be supported by the fact that Carl in Byholma (who married Hans widow) was a witness of Gummes daughter - why would he be that if not "related".
On the other hand Jon buys half of Wåkön from Per Gudmundsson and Bengta Gudmundsdotter in Ormhult and Gunnel Gudmundsdotter, whoever they were and how they got their 1/8 part of Wåkön...
1676 the owner of Håkanhult wanted to pay less tax and thought that Wåkön should take over part of that responsibilty, or that he could take over part of Wåkön. Jöns and another part showed old document to prove his family had the tax rights since a long time and the court agreed.