Stamvader Jan Pieterszoon Louw's Y-DNA haplogroup has been identified as I2b1 through the testing of two of his living descendants some years ago already, one being my husband and another being another member of SAGenealogie. They are recorded in a SAG DNA database at https://groups.yahoo.com/neo/groups/SAGenealogie/database/17/edit - this is however a closed group so will only be able to be viewed by group members.
I have added it to the profile overview. Is there a way of adding this information under the DNA tab which is more likely where someone may be looking for it?