Judo in fact is based on both western wrestling and jiu-jitsu.
A lot of us also get the impression that they kept changing the rules to favour their own style and their own body types. Recently, leg grabs were banned, for instance. Judo in fact is based on both western wrestling and jiu-jitsu. It's an interesting take on both. It's sad how much things in Japan changed from the first generation of judo - it used to be for all ages and a lifelong activity but it turned into a children's competitive sport. Interestingly, jacket wrestling or something similar (like belt wrestling) has been popular almost everywhere in the world.