When the Orbots record a farewell message for Rob, they sign off by stating their names individually. They state their names in the same order as the "roll-call" segment of the opening credits.
The Orbots celebrate their birthday in this episode. It's implied that all of the Orbots are the same age, however in the pilot episode, Tor says that Ohno is so bossy because she was built first. This could mean that while Ohno was built first, perhaps they were all brought on-line on the same day.
The last episode of the series.