Yes I do. I believe that the funeral isn't for the dead person, it's for their family and friends and going shows support. If the only people who went to funerals were those who actually knew the deceased, they'd be pretty small affairs.
One of my brothers died in October and I was really touched by the people who came to his wake and funeral. People who know only M., or only one of my parents or siblings, came to give their condolences and it was very touching and helped a lot. In J. the past year I have gone to funerals for one friend's grandmother and father and another friend's mother.
I'm Catholic and the general expectation is that most people go to the wake and then the funeral Mass is generally attended by close friends and family, so when I say that I go, often it's to the wake and not the funeral Mass. But if someone is of a religion (or no religion) that has J. a single funeral or memorial service, I go to that.