Ken-David Masur has earned a prime gig for a young conductor, even one with a famous last name. Masur, 37, currently the principal guest conductor of the Munich Symphony and associate conductor of the San Diego Symphony, will begin a two-year term as an assistant conductor at the Boston Symphony Orchestra later this year. He will lead his first concert in that role at Tanglewood in 2015, with a Symphony Hall performance later in the year. Of course, Masur is no stranger to the stage. He made his BSO debut in 2012, sharing the podium with his father, Kurt , in a concert at Tanglewood. In 2011 and 2012, Ken-David Masur was a Tanglewood Music Center conducting fellow. Is it hard being a conductor with that last name, he was asked at the time. “The answer is simple,” Ken-David said. “It could be hard, but it’s not. Because to me, it’s a big gift, it’s a great gift that I actually get to sort of relive my father’s beginnings through my beginnings of conducting.”Geoff Edgers can be reached at email@example.com. Follow him on Twitter @geoffedgers.