(a) A lawyer shall not use a firm name, letterhead or other professional designation that violates Rule 7.1. A trade name may be used by a lawyer in private practice if:
(1) the trade name includes the name of at least one of the lawyers practicing under said name. A law firm consisting solely of the name or names of deceased or retired members of the firm does not have to include the name of an active member of the firm;
(2) the trade name does not imply a connection with a government entity, with a public or charitable legal services organization or any other organization, association or institution or entity, unless there is, in fact, a connection; and
(3) the trade name is not otherwise in violation of Rule 7.1.
(b) A law firm with offices in more than one jurisdiction may use the same name or other professional designation in each jurisdiction, but identification of the lawyers in an office of the firm shall indicate the jurisdictional limitations on those not licensed to practice in the jurisdiction where the office is located.
(c) The name of a lawyer holding a public office shall not be used in the name of a law firm, or in communications on its behalf, during any substantial period in which the lawyer is not actively and regularly practicing with the firm.
(d) Lawyers may state or imply that they practice in a partnership or other organization only when that is the fact.