Proto-Germanic: *arwa-; *irnan- vb.
Meaning: quick, active
Old Norse: ɔr-r `freigebig, milde'
Old English: earu `quick, active, ready'; arod `quick, swift, ready, prepared'; irnan (arn, urnon; urnen) `id.', { ärnan }
Old Saxon: aru `hurtig, bereit, flink'
