That was my thought too. He probably does know everyone's names but stumbles from time to time for effect.
I did like a fanfic I once read which had the notion that Bruce was an efficient, but reserved, boss and it wasn't until Dick came along and visited the Wayne Foundation with him a couple of times that Bruce suddenly found himself hearing about "Jane from Accounting" having her baby and "Bob in R&D" wanting time off to visit his sick mother, and becoming a more human boss and how much more effective a company he had as a result.