70 ILCS 405/15.01
Whenever it is desired to change the name of an existing district the directors shall submit the proposed new name to the Department, together with their reasons for desiring the change. If the Department approves the change it shall submit the proposed name to the Secretary of State who, if he finds that the proposed name is not identical with that of any other district of this state or so nearly similar as to lead to confusion or uncertainty, he shall receive and record the change in an appropriate book of record in his office. If the Secretary of State finds that the name proposed for the district is identical with that of any other district of this State, or so nearly similar as to lead to confusion and uncertainty, he shall certify such fact to the Department, which shall thereupon submit to the Secretary of State a new name for the district, which is not subject to such defects and which is satisfactory to the directors. Upon receipt of such new name, free of such defects, the Secretary of State shall record the change in an appropriate book of record in his office.
70 ILCS 405/15.01