Proto-Germanic *Wiljahelmaz

→ English William (derived)

→ English Wilamowice (derived)

→ Welsh Gwilym (derived)

→ Middle Dutch willem (derived)

→ Greek Γουλιέλμος (derived)

→ Faroese Vilhjálmur (inherited)

→ Old French Guillaume (derived(fro/fr))

→ Galician Guillerme (derived)

→ Icelandic Vilhjálmur (inherited)

→ Latin Gulielmus (derived)

→ Portuguese Guilherme (mention)