Answer
The middle name'Kemp' in Terence Kemp McKenna represents the family name of his father. McKenna's father, Edward "Ed" Kemp McKenna, was a professor of philosophy at the University of California, Berkeley, and his mother, Ruth McWilliams McKenna, was a poet. McKenna was born in December 1946 in Paonia, Colorado, and grew up in the San Francisco Bay Area.