Hajoca is still around. The website says:

Is Hajoca named after the town where it was established? That's not it either. Hajoca was founded in Philadelphia, PA and we are still headquartered right outside of the city today.

Was there a Mr. Hajoca? Well not quite, but you're onto something now!

Our name is derived from the last names of three visionaries who saw a demand for indoor plumbing (a relatively new concept in the 19th century) and vowed to make it easily available:

William H. HAines, Thomas J. JOnes and Joel CAdbury: HAJOCA for short.