Several area counties have their own bus services to supplement the D.C. area Metrobus service. The names of these services reflect the personalities of the communities that they serve.
Fairfax County has the Fairfax Connector. The word "connector" has an engineering feel to it, like gear or cog - perhaps reflecting the high tech personality of Northern Virginia. You can imagine a commuter saying something like, "I have to work late in my database administration job tonight in Tysons to help with a disaster recovery test. Thanks goodness the Connector is running to facilitate my trip home."
Montgomery County residents have Ride-On - a progressive and hip sounding bus line that has its own passenger bill of rights and responsibilities and free service on code red ozone action days. You can imagine a Montgomery County commuter saying something like, "what a beautiful day. The sun is shining. The birds are singing, and I'm so fortunate that I can Ride-On to work at my non-profit job and reduce my carbon footprint."
In Prince George's County, we like things nice and simple. We don't care about the official name of the bus service because we're just going to call it "the bus" anyway. So it just makes sense to call it The Bus.