Old Norse þǫkk

→ Old English þanc (cognate)

→ Danish tak (inherited)

→ Faroese ta (derived(fo/en))

→ Faroese takk (derived)

→ Faroese tøkk (inherited)

→ Icelandic takk (derived)

→ Icelandic þökk (inherited)

→ Norwegian Bokmål takk (inherited)

→ Norwegian Nynorsk takk (inherited)

→ Swedish tack (derived)