14 Ill. Adm. Code 178.150
Surnames
Section 178
Section 178.150 Surnames
A surname shall be considered a
"word". Where a limited liability company name consists of a surname
without a given name or initials, it is treated in the same manner as other
words for application of this Subpart. A person may use his or her own name in
a limited liability company name, but the limited liability company name must
still be distinguishable from other limited liability company names.