←
Old English froþy (inherited)
←
Old English forþon (mention)
←
Old English for (mention)
←
Old English þȳ (mention)
←
Old English þon (mention)
←
Old English þæt (mention)
←
Middle English forthy (inherited)
←
Norwegian fordi (cognate)
→
Middle English forthi (link)
→
Swedish förty (cognate)