Old Norse þunnr

← Old English þynne (cognate)

← Dong dunni (cognate)

← Proto-Germanic *þunnuz (inherited)

← Proto-Indo-European *tenh₂- (root)

← Proto-Indo-European *ténh₂us (inherited)

→ Old English þynne (cognate)

→ Welsh tenau (cognate)

→ Danish tynd (derived)

→ Faroese tunnur (derived)

→ Irish tanaí (cognate)

→ Old High German dunni (cognate)

→ Icelandic þunnur (derived)

→ Norwegian Bokmål tynn (derived)

→ Norwegian Nynorsk tynn (derived)

→ Old Irish tanae (cognate)

→ Swedish tunn (derived)