West Frisian tongersdei

← Proto-West Germanic *Þunras dag (inherited)

← Latin diēs Iovis (derived)

← Old Frisian *thunersdei (inherited)

→ English Thursday (cognate)

→ German Donnerstag (cognate)

→ Luxembourgish Donneschdeg (cognate)

→ Saterland Frisian Tuunsdai (cognate)