| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 381 | Arlinda | English | Modern blend of Arlene and Linda. | F | |
| 382 | Arline | English | Variant of Carlene and Charlene. | F | |
| 383 | Arlo | English | Fortified hill. | M | |
| 384 | Arlyn | English | Variant of Carlene and Charlene. | F | |
| 385 | Arlyne | English | Variant of Carlene and Charlene. | F | |
| 386 | Armstrang | English | Strong armed. | M | |
| 387 | Armstrong | English | One with a strong arm. | M | |
| 388 | Arnatt | English | Little eagle. | M | |
| 389 | Arnaud | English | Variant of Arnold: Derived from an old German name meaning eagle power. The eagle rules. Introduced into Britain during the Norman Conquest, and used for a number of English surnames. Famous bearer: British poet and critic Matthew Arnold. | M | |
| 390 | Arndell | English | From the eagle's dell. | M | |
| 391 | Arnelle | English | Modern variant of Amold. | F | |
| 392 | Arnet | English | Little eagle. | M | |
| 393 | Arnett | English | Little eagle. | M | |
| 394 | Arnold | English | Derived from an old German name meaning eagle power. The eagle rules. Introduced into Britain during the Norman Conquest, and used for a number of English surnames. Famous bearer: British poet and critic Matthew Arnold. | M | |
| 395 | Arnott | English | Little eagle. | M | |
| 396 | Arrick | English | Variant of Aric 'rule with mercy.'. | M | |
| 397 | Art | English | Diminutive of Arthur: From the Roman clan name Artorius, meaning noble, courageous. Famous bearer: Legendary sixth century King Arthur of Britain and his Round Table of knights. This legend dates to the early 9th century. | M | |
| 398 | Arthur | English | From the Roman clan name Artorius, meaning noble, courageous. Famous bearer: Legendary sixth century King Arthur of Britain and his Round Table of knights. This legend dates to the early 9th century. | M | |
| 399 | Arthuretta | English | Feminine form of Arthur: From the Roman clan name Artorius, meaning noble, courageous. Famous bearer: Legendary sixth century King Arthur of Britain and his Round Table of knights. This legend dates to the early 9th century. | F | |
| 400 | Arthurina | English | Feminine form of Arthur: From the Roman clan name Artorius, meaning noble, courageous. Famous bearer: Legendary sixth century King Arthur of Britain and his Round Table of knights. This legend dates to the early 9th century. | F | |