| 1 | Icelandic | for- | previous, before, first, pre-; extremely;... |
| 2 | Old Norse | for- | for; fore- |
| 3 | Middle Low German | vor- | modyfying verb-prefix, denoting amongst other... |
| 4 | Old Saxon | far- | forming verbs from verbs with various senses... |
| 5 | Proto-Germanic | fra- | off, away; completely, fully, up |
| 6 | Proto-Indo-European | pro- | toward, forward |
| 7 | Proto-Indo-European | por- | to give birth; forward, through; going, passage |
| 8 | Proto-Indo-European | per- | before, in front; first; to go through |
| 9 | Proto-Indo-European | pr̥tós | passed , crossed |