Without a DBA trade business name filing, your business has to use its legal name which is the owner's last name.  State law even requires you to operate your business under a filed  DBA trade name even if a variation of your legal business name is used, and even if used for a short  time.

Businesses using a name other than the owner's name are required to register a DBA / Fictitious Business Name Certificate. Note that you can incorporate or form an LLC instead of filing a DBA. If you are an LLC or Corporation you don't need a dba.

DBA, short for "doing business as", is a filing that shows that business under a different name. DBA's are commonly referred to as a fictitious business names, assumed business and trade names. 

3-5 Business Days

Users of a trade name other than their last name or the corporation's or LLC's legal name.