There isn't one.

Okay, but only sort of. The speech was just named after the place where it was delivered, either "Remarks at the Rudolph Wilde Platz" or "Speech from the Rathaus Schöneberg." The Rudolph Wilde Platz was the town square (today John F. Kennedy Platz) and the Rathaus Schöneberg was a city hall in West Berlin.

But the speech became famous for its opening and closing lines containing the German phrase "Ich bin ein Berliner," so that's what people ultimately called it.