Old Norse þykkja

← Proto-Germanic *þunkijaną (inherited)

← Proto-Indo-European *teng- (root)

→ Old English þyncan (cognate)

→ Danish tykkes (inherited)

→ Old Swedish þykkia (inherited)

→ Icelandic þykja (derived)

→ Norwegian Nynorsk tykkja (inherited)

→ Old Norse þykt (link)

→ Swedish tycka (inherited)