←
Proto-Celtic *swīs (mention)
←
Proto-Celtic *uɸor (inherited)
←
Proto-Indo-European *upér (inherited)
→
Old English ofer (cognate)
→
Scottish Gaelic air (derived)
→
Scottish Gaelic air (inherited)
→
Scottish Gaelic ur (inherited)
→
Middle Irish for (inherited)
→
Old Irish for- (mention)
→
Old Irish forsa (affix)
→
Old Irish immar (mention)