Ill. Admin. Code tit. 14 § 150.435
A corporate name shall be distinguishable upon the record of the Secretary of State, Department of Business Services, from the name or assumed name of any domestic corporation or limited liability company organized under the Limited Liability Company Act, whether profit or not for profit, existing under any Act of this State or of the name or assumed name of any foreign corporation or foreign limited liability company registered under the Limited Liability Company Act, whether profit or not for profit, authorized to transact business in this State, or a name the exclusive right to which is, at the time, reserved or registered in the manner provided in the Act or Section 1-15 of the Limited Liability Company Act.
Ill. Admin. Code tit. 14, § 150.435
Amended at 27 Ill. Reg. 550, effective December 27, 2002