Alias is a different name by which a person is known.
In the real estate world, there are times when an agent goes by a different name than the one he/she was originally named by his/her parents. Sometimes an agent uses an alias for marketing purposes, to better appeal to its community, make it shorter and easier to remember. Sometimes it's a nickname by which he/she is most known within the community. Sometimes the agent wants to refresh and rebrand himself/herself to the market? Sometimes it’s just because the agent hates his/her own name.
In any case, an alias is a different name from the one displayed on a person’s birth certificate.