| 1 | Old Norse | gap | gap, empty space; shouting, crying, gab |
| 2 | Old Norse | gapa | to gape, open the mouth wide |
| 3 | Proto-Germanic | gapōną | to gaze, observe |
| 4 | Proto-Indo-European | ǵʰeh₁y- | to yawn, gape; to gape, be wide open; to gape,... |
| 5 | Proto-Indo-European | ǵʰih₁- | — |