| 1 | Latin | brachium | Alternative form of bracchium; arm, branch; limb |
| 2 | Latin | bracchium | forearm; arm; limb of an animal |
| 3 | Ancient Greek | βραχίων | the arm, the shoulder; comparative degree of... |
| 4 | Ancient Greek | βραχύς | short, brief; short, small, little; few |
| 5 | Proto-Indo-European | mréǵʰus | short; brief |
| 6 | Proto-Indo-European | mreǵʰ- | short |