...from the son of philosopher and longtime UCLA faculty member David Kaplan in honor of both his father and his mother, a clinical psychologist, also at UCLA. (The Kaplans' son made his money in real estate investing.) Apart from Johns Hopkins, this will probably make UCLA the best-endowed philosophy department in the United States. (My guess is Michigan will be #3 in that regard, though I'm not certain.)
UCLA has been a top department in the U.S. since the 1950s, when Hans Reichenbach was on the faculty (his PhD students included Hilary Putnam and Wesley Salmon). Kaplan took his own PhD at UCLA, under the supervision of Rudolf Carnap.