(a) The name of a professional limited liability company or foreign professional limited liability company must contain:
(1) the phrase "professional limited liability company"; or
(2) an abbreviation of that phrase.
(b) A professional limited liability company or foreign professional limited liability company formed before September 1, 1993, the name of which complied with the laws of this state on the date of formation but does not comply with this section, is not required to change its name.