Bach is the surname of a number of people:

The Bach Dynasty

Johann Sebastian Bach (Composer, organist)
Wilhelm Friedemann Bach (Composer, organist)
Carl Philipp Emanuel Bach (Composer, harpsichordist)
Johann Bernhard Bach (Composer, harpsichordist, organist)
Johann Christoph Friedrich Bach (Composer)
Johann Ludwig Bach (Composer)
Johann Christian Bach (Composer)

P. D. Q. Bach (Fictitious composer, alter ego of Peter Schickele)
Barbara Bach (actress) [1]
Richard Bach (novelist)
Vincent Bach, trumpet player and founder of famous US trumpet-making company

There is also the BACH motif, which features in a number of pieces of music.

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