Follow the regulations in your state.

You would need to consult the laws and regulations and perhaps the regulator of the industry and jurisdiction that your query relates to.

dba's are allowed in most states. there are brokers owning multiple "names"

Sarah Bean In my experience most companies do to maintain their brand.

Great question - looking forward to your answer!

Depends on your state regulations. 

Sarah Bean it is a good idea to keep the brand name. Not sure if it is necessary or not.

A slight variation...sometimes indicating location and other times more generic....abc realty Lakeside   or abs realty elite

in alberta canada, yes.

In our area the Principal Broker is now called a Managing Broker.