| Aveline | | AV-ə-lien, av-ə-LEEN | English (Rare) | |
| Averill | | - | English (Rare) | |
| Avice | | AY-vis | English (Rare) | |
| Avril | | av-REEL (French), AV-ril (English) | French (Rare), English (Rare) | |
| Aylmer | | - | English (Rare) | |
| Azalea | | ə-ZAY-lee-ə, ə-ZAYL-yə | English (Rare) | |
| Azura | | a-ZHUR-ə, AZH-rə | English (Rare) | |
| Azure | | A-zhər | English (Rare) | |
| Babylas | | - | Late Greek, French (Rare) | |
| Baghdasar | | - | Armenian (Rare) | |
| Bagrat | | - | Armenian, Georgian (Rare) | |
| Balbina | | bahl-BEE-nah (Italian) | Spanish (Rare), Portuguese (Rare), Italian (Rare), Ancient Roman | |
| Balbino | | - | Spanish (Rare), Portuguese (Rare), Italian (Rare) | |
| Balfour | | - | English (Rare) | |
| Barclay | | - | Scottish, English (Rare) | |