(adjective) : Plancus, i, m. (flat-footed)
* A Roman surname: plancae tabulae planae, ob quam causam et planci appellantur qui supra modum pedibus plani sunt, Paul. ex Fest. p. 231 Müll.: vola homini tantum, exceptis quibusdam: namque et hinc cognomina inventa Planci, Plauti, Scauri, Pansae,Plin. 11, 45, 105, § 254: plancus, πλατύπους, Gloss. Cyrill.: στεγανόποδες, planci, Gloss. Gr. Lat. So, Munatius Plancus, v. Munatius.—Hence
* Plancĭānus, a, um, , Plancian: Diana, who had a shrine in the house of the Planci, Viscont. Mus. Pio Clem. 2, p. 21 Mediol.

Male Personal name
Confirmed occurences in the Roman Empire:

• L. Munatius Plancus (Masc, senator), ref: PIR M 0728 | PIR ID9432
• L. Munatius Plancus Paulinus (Masc, senator), ref: PIR M 0729 | PIR ID9433
• Plancus (Masc), ref: PIR P 0446 | PIR ID10467
• L. Plotius Plancus (Masc, senator), ref: PIR P 0514 | PIR ID10548
• Rubrius Plancus (Masc), ref: PIR R 0123 | PIR ID11503