Who are all members of Namikaze clan and is Namikaze clan a descendant of Senju clan? I know Minato (the fourth Hokage) is of the Namikaze clan, but I have never heard of anyone other than him belonging to the same clan. What is the Namikaze clan's history? Is it part of the Senju clan?
Namikaze isn't a descendant of Senju. I think it would have been mentioned in the past if it was, just like how it was stated Uzumaki is related to Senju. The past references has been brought up so many times with Kushina having Senju DNA, and therefore Naruto has it too.

As for all the members, we only know of Minato. No other Namikaze member was revealed in the manga. I haven't watched all the fillers, but there might have been another Namikaze person in there.