I presume you are aware his identity was never discovered - so how would anybody know if he was one of their ancestors?
How would a "Ripperologist" uncover his identity sufficiently to link him to a present day family 134 years later?
https://www.history.com/topics/british-history/jack-the-ripper
I doubt anybody has anything to worry about
Ripperologists also tend to be interested in the lives of the victims and other figures involved in the case. There have been a few books that dealt with this specifically and which tend to delve into genealogy.
I suppose living descendants of people whose lives intersected with the case are fairly likely to be contacted by Ripperologists and/or other historians at some point or other, but you obviously have no ownership over your ancestors and if they are of historical interest they will inevitably be investigated and discussed.
Edit: one other point I neglected to mention is that while Jack the Ripper was never caught, there continue to be a huge number of suspects put forth and many of them will have direct descendants living today.