←
Proto-Germanic *rattaz (inherited)
←
Middle High German ratte (inherited)
←
Old High German ratta (inherited)
←
Old High German rato (mention)
←
Old Saxon ratta (derived)
←
Swedish råtta (cognate)
→
Old High German rato (cognate)
→
Luxembourgish Rat (cognate)
→
Pennsylvania German Ratt (cognate)