Proper name: GALLA, SO′SIA, the wife of C. Silius [Silius], involved with him in a charge of treason A. D. 24. The pretext for Galla's impeachment was, that during her husband's command in Upper Germany, in A. D. 14, she had sold her influence with him, and shared in his exactions on the provincials. But the real motive was Galla's intimacy with Agrippina, the widow of Germanicus. Galla was sent into banishment. (Tac. Ann. iv. 19, 20.) (Wikisource | public domain)

Galla (noun F) :
* A female Gaul; v. 1. Galli, I.

Galla (noun F) :
* A priest of Cybele; v. 3. Gallus, II. A.

Feminine Personal name
Confirmed occurences in the Roman Empire:

• Aelia Galla (Fem), ref: PIR A 0294 | PIR ID650
• Asidonia Galla (Fem), ref: PIR A 1218 | PIR ID2101
• Atria Galla (Fem, senator), ref: PIR A 1323 | PIR ID2236
• Baebia Galla (Fem), ref: PIR B 0032 | PIR ID2828
• Caelia Galla (Fem), ref: PIR C 0144 | PIR ID3213
• Caninia Galla (Fem, senator), ref: PIR C 0396 | PIR ID3581
• Cocceia Galla (Fem, senator), ref: PIR C 1233 | PIR ID4658
• Cottia Galla (Fem, senator), ref: PIR C 1551 | PIR ID5074
• Didia Galla (Fem), ref: PIR D 0081 | PIR ID5297
• Galla (Fem), ref: PIR G 0035 | PIR ID6523
• Laberia Galla (Fem, senator), ref: PIR L 0014 | PIR ID8109
• Memmia Galla (Fem), ref: PIR M 0483 | PIR ID9134
• Mevia Galla (Fem), ref: PIR M 0585 | PIR ID9258
• Numisia Galla (Fem), ref: PIR N 0218 | PIR ID9721
• Pomponia Galla (Fem), ref: PIR P 0773 | PIR ID10763
• Quintia Galla (Fem, senator), ref: PIR Q 0049 | PIR ID11279
• Satria Galla (Fem), ref: cf. A 1323 | PIR ID11866
• Sosia Galla (Fem, senator), ref: PIR S1 0563 | PIR ID12554
• Vibia Galla (Fem), ref: AE 1962, 30 | PIR ID14334