Dĕcĭmus | Dĕcĭma, ae | Dĕcĭmiānus, a, um (noun M.f) : m., , , f.
* Proper names.
* Decimus, a Roman praenomen, abbrev. D. In the gens Claudia it was given only to patricians; but among the Junii and Laelii to plebeians also; cf. Varr. L. L. 9, § 61 Müll.—Hence, , , adj., named for Decimus: pirus,Plin. 15, 15, 16, § 54.
* Decima, the goddess that presides over accouchements, a partus tempestivi tempore, Varr. and Caesel. ap. Gell. 3, 16, 10 sq.; cf. also Tert. Anim. 37; id. adv. Val. 32.

Male Personal name
Confirmed occurences in the Roman Empire:

• M. Aurelius Decimus (Masc, eques), ref: PIR A 1490 | PIR ID2509
• Decimus (Masc), ref: Cod. Iust. 1, 54, 2 | PIR ID5236
• Flavius Decimus (Masc, senator), ref: PIR F 0254 | PIR ID6059
• T. Flavius Decimus (Masc, senator), ref: PIR F 0255 | PIR ID6060
• ...gius Decimus (Masc), ref: PIR D 0024 | PIR ID6692
• Q. Iunius Quintianus Q. Iunius Decimus Quintianus (Masc, senator), ref: PIR I 0804 | PIR ID7998
• Pullaienus Petronianus Decimus Florentius (Masc, senator), ref: PIR P 1077 | PIR ID11201

s. TLL