| Name | Meaning | Gender | Origin |
| Achates | Figure in ancient Greek mythology who was the companion of Aeneas. | M | Greek |
| Achav | Uncle. | M | Hebrew |
| Achaz | One that takes or possesses. | M | Biblical |
| Achazia | Variant of Achazya: God has taken. | M | Hebrew |
| Achaziah | Variant of Achazya: God has taken. | M | Hebrew |
| Achazya | God has taken. | M | Hebrew |
| Achazyahu | Variant of Achazya: God has taken. | M | Hebrew |
| Achban | Brother of a smart man. | M | Hebrew |
| Achbor | A rat; bruising | M | Biblical |
| Acheflow | White flower. | F | Arthurian Legend |
| Achelous | A river god. | M | Greek |
| Acher | Other. | M | Hebrew |
| Acheron | River of sorrow/woe. | M | Greek |
| Acheros | River of sorrow. | M | Latin |
| Achida | Smart brother. | M | Hebrew |
| AchiIles | Lipless. | M | Greek |
| Achilles | Mythology: a hero of the Trojan war | M | Greek |
| Achimelech | The king is my brother. | M | Hebrew |
| Achir | New. | M | Indian |
| Achisar | The prince is my brother. | M | Hebrew |
| Achish | Thus it is/ how is this. | M | Biblical |
| Achishar | My brother is a song. | M | Hebrew |
| Achivus | A Greek. | M | Latin |
| Achiya | God is my brother. | M | Hebrew |
| Achiyahu | Variant of Achiya: God is my brother. | M | Hebrew |
| Achmetha | Brother of death | M | Biblical |
| Ackerley | meadow of oak trees | M | English |
| Acrisioniades | Descendant of Acrisius. | M | Latin |
| Acrisius | Grandfather of Perseus. | M | Greek |
| Actaeon | In ancient Greek mythology Actaeon was a hunter dismembered by his own dogs. | M | Greek |
| Acton | Oak tree settlement | M | English |
| Actoris | Son of Azeus. | M | Latin |
| Acwel | Kills. | M | Anglo-Saxon |
| Acwellen | Kills. | M | Anglo-Saxon |
| Ada | Noble/ Kind | F | German |
| Adah | Beautiful Addition | F | Hebrew |
| Adair | Noble/ Exalted | E | English |
| Adalia | God is my Refuge/ Noble | F | German |
| Adalwin | Noble friend. | M | German |
| Adalwine | Noble friend. | M | German |
| Adalwolf | Noble wolf. | M | German |
| Adalwolfa | Noble she wolf. | F | German |
| Adalyn | Variant of Adela. | F | French |
| Adam | Mankind | M | Hebrew |
| Adamek | Variant of Adam: Man of the red earth. Adam was the first man created by God. | M | Hebrew |
| Adamh | Variant of Adam: Man of the red earth. Adam was the first man created by God. | M | Hebrew |
| Adami | My man; red; earthy; human | M | Biblical |
| Adamik | Variant of Adam: Man of the red earth. Adam was the first man created by God. | M | Hebrew |
| Adamina | The Earth | F | Hebrew |
| Adamka | Variant of Adam: Man of the red earth. Adam was the first man created by God. | M | Hebrew |