There were two other founders and they were all equal partners, so I asked one of them why Callan was the one it was named after.
What happened was that they had been unable to agree on a name all throughout the early stages of starting the company. They got to the point where they really need to incorporate to continue, but still could not agree on a name.
Tempers were rising and they decided to step away for a few days to calm down, and during that time two of them went out of town for a hunting trip. Callan stayed home.
When the other two got back Callan told them that he'd incorporated with a temporary name, which they could change when they finally thought of a real name they liked. The other two were annoyed, but agreed that this was better than having everything be on hold because they could not incorporate.
That temporary name was "Callan Data Systems" and they never did come up with a replacement, and stopped trying when it had been so long that changing the name would have been a pain.