Use the author's last name

Warning²Federal courts, Illinois courts21st and 22nd editions

A periodical article's later “supra” form uses the author's last name, not the full name from its first full citation.¹

1. 1R. 16.9(b) Supra. Tables: R. 4.2(a) “Supra.”; R. 16.4 Consecutively Paginated Journals; B16.2 Short Form Citation.
2. 2A warning: the form is usually wrong under the rule in note 1, and context can justify it.