| Name | Meaning | Gender | Origin |
|---|
| Ace Of Spades | | Male | Hebrew |
| Addis | Son Of Adam | Unisex | English |
| Aesop | | Male | Hebrew |
| Aindreas | Strong
| Male | |
| Ajani | He Who Wins the Struggle. Victorious.
| Male | Nigerian |
| Algie Longbottom | Neville's great uncle.
| Male | |
| Ali | Muslim - Noble, Exalted, God, little, the highest | Male | Arabic |
| Ambrosio | Divine
| Male | |
| Amoldo | The eagle rules.
| Male | |
| Anastasio | Resurrected
| Male | |
| Angel | Angel
| Male | Word |
| Anwar | brighter, clearer | Male | Arabic |
| Arthur Weasley | Ron's father, head of Misuse of Muggle Artifacts.
| Male | |
| Aslan | | Male | Hebrew |
| Atari | | Unisex | Hebrew |
| Atlas | Endures, Suffers | Male | Greek |
| Atom | | Male | Hebrew |
| Augustus Rookwood | | Unisex | |
| Bach | | Male | Hebrew |
| Baldrick | Princely ruler. | Male | |
| Baracca | | Male | Hebrew |
| Basil | Majestic, royal, brave | Male | Greek |
| Basket | Gertrude Stein's two dogs of the same names. They are described in works that Stein wrote in France during the period of the German occupation (1940-1945).
| Male | |
| Bedwyr | Arthurian legend name
| Male | |
| Berta | glorious, learning | Unisex | |