Male Personal name
Confirmed occurences in the Roman Empire:
- L. Antonius Firmus (Masc, eques), ref: PIR A 0830 | PIR ID1591
- Aurelius Firmus (Masc), ref: AE 1966, 188 | PIR ID2532
- Cn. Avidius Celer ... Cn. Avidius Celer Rutilius Lupus Fiscilius Firmus (Masc, senator), ref: PIR A 1403 | PIR ID2775
- Cn. Avilius Firmus (Masc, senator), ref: PIR A 1413 | PIR ID2786
- P. Avilius Firmus (Masc), ref: RE Suppl. 14 (1974) 67 s.v. Avillius 2c | PIR ID2787
- Baebius Valerius Firmus (Masc), ref: PIR B 0030 | PIR ID2862
- Burrenus Firmus (Masc), ref: III 646 | PIR ID3042
- Castricius Firmus (Masc), ref: PIR C 0543 | PIR ID3772
- Claudius Firmus (Masc, eques), ref: PIR C 0867 | PIR ID4286
- C. Claudius Firmus (Masc, eques), ref: PIR C 0868 | PIR ID4287
- Claudius Firmus C. Claudius Firmus (Masc, eques), ref: PIR C 0866 | PIR ID4288
- Claudius Firmus C. Claudius Firmus (Masc, eques), ref: PIR C 0866 | PIR ID4288
- M. Cocceius Firmus (Masc), ref: AE 1924, 143 | PIR ID4669
- M. Cornelius Firmus (Masc, senator), ref: PIR C 1361 | PIR ID4874
- M. Cornelius Firmus (Masc, senator), ref: RE Suppl. 14 (1974) 107 s.v. Cornelius 154a | PIR ID4875
- Cossitianus Firmus (Masc, eques), ref: PIR C 1539 | PIR ID5053
- ... Firmus (Masc, senator), ref: PIR F 0159 | PIR ID5856
- Firmus (Masc, senator), ref: PIR F 0165 | PIR ID5857
- Firmus (Masc), ref: PIR F 0160 | PIR ID5858
- Firmus (Masc), ref: PIR F 0161 | PIR ID5859
- Firmus (Masc), ref: PIR F 0162 | PIR ID5860
- Firmus (Masc), ref: PIR F 0163 | PIR ID5861
- Firmus (Masc), ref: PIR F 0164 | PIR ID5862
- ...ius Firmus (Masc), ref: P. Osl. 181 | PIR ID8061
- A. Licinius Nerva Silianus P. Pasidienus Firmus A. Licinius Nerva Silianus (Masc, senator), ref: PIR L 0225 | PIR ID8349
- ...lius Firmus (Masc, eques), ref: PIR F 0166 | PIR ID8410
- Nasidius Firmus ... (Masc, senator), ref: AE 1988, 1117 | PIR ID9510
- M. Ofasius Firmus Marus Cornelius Cossinus (Masc), ref: PIR O 0077 | PIR ID9858
- P. Pasidienus Firmus (Masc, senator), ref: PIR P 0139 | PIR ID10125
- L. Pasidienus Firmus (Masc, senator), ref: PIR P 0138 | PIR ID10126
- C. Petillius Firmus (Masc, senator), ref: PIR P 0261 | PIR ID10268
- Plotius Firmus (Masc, eques), ref: PIR P 0503 | PIR ID10537
- Pollio Plotius Firmus (Masc, eques), ref: Plut. Otho 18, 4 cf. P 0503 | PIR ID10591
- Romatius Firmus (Masc), ref: PIR R 0082 | PIR ID11443
- C. Rufius Festus Laelius Firmus (Masc, senator), ref: PIR R 0157 | PIR ID11535
- Saturius Firmus (Masc, senator), ref: PIR S 0209 | PIR ID11886
- Saturius Firmus (Masc), ref: PIR S 0210 | PIR ID11887
- Satyrius Firmus (Masc, senator), ref: AE 1946, 204 | PIR ID11907
- C. Servilius Septidianus Firmus (Masc, senator), ref: PIR S1 0426 | PIR ID12341
- T. Settidius Firmus (Masc, senator), ref: RE Suppl. 14 (1974) 666 s.v. Settidius 1 | PIR ID12362
- C. Settidius Firmus (Masc, senator), ref: RE Suppl. 14 (1974) 666 s.v. Settidius 2 | PIR ID12363
- Tib. Calavius Firmus (Masc), ref: Plut. Quaest. conv. 2, 3, 3, 636 F | PIR ID13106
- C. Tullius Capito Pomponianus Plotius Firmus (Masc, senator), ref: PIR T1 0271 | PIR ID13348
- C. Valerius Firmus (Masc, eques), ref: ANRW 10, 1, 493 | PIR ID13828
- L. Valerius Firmus (Masc, eques), ref: RE Suppl. 14 (1974) 819 s.v. Valerius 159a | PIR ID13829
- T. Prifernius Paetus Settidianus Firmus (Masc, senator), ref: I. Rodà Epigraphica 67, 2005, 269 ff. = AE 2005, 542 | PIR ID14868