(adjective) : Rŭ_brĭus, i, m.; Rŭ_brĭa, ae, f.
* The name of a Roman gens; masc. Rubrius, Cic. Verr. 2, 1, 25, § 64; id. Phil. 2, 16, 40; id. Brut. 45, 168; Caes. B. C. 1, 23.—Fem. Rubria, Cic. Fam. 9, 21, 3.—Adj.: Lex Rubria (or lex Galliae Cisalpinae), of the year B. C. 43; v. Becker, Antiq. 3, 1, p. 51, and the authors there cited.—Hence
* Rŭ_brĭ-ānus, a, um, , of or belonging to a Rubrius, Rubrian: senatusconsultum,Dig. 40, 5, 26, § 9; 40, 5, 28 pr.

Male Personal name
Confirmed occurences in the Roman Empire:

• Rubrius (Masc), ref: PIR R 0121 | PIR ID11495
• Rubrius (Masc), ref: PIR R 0122 | PIR ID11496
• T. Rubrius Aelius Nepos (Masc, senator), ref: PIR R 0124 | PIR ID11497
• P. Rubrius Barbarus (Masc, eques), ref: PIR R 0125 | PIR ID11498
• Rubrius Fabatus (Masc), ref: PIR R 0126 | PIR ID11499
• Rubrius Gallus (Masc, senator), ref: PIR R 0127 | PIR ID11500
• Rubrius Gallus (Masc, senator), ref: PIR R 0128 | PIR ID11501
• T. Rubrius Nepos (Masc, senator), ref: PIR R 0129 | PIR ID11502
• Rubrius Plancus (Masc), ref: PIR R 0123 | PIR ID11503
• C. Rubrius Vinicius Porcius Marcellus (Masc, senator), ref: PIR P 0860 | PIR ID11504