Old English þæc

← Proto-West Germanic *þak (inherited)

← Old High German dah (cognate)

← Old Norse þak (cognate)

← Old Frisian thak (cognate)

← Old Saxon thak (cognate)

→ English thack (inherited)

→ English thatch (inherited)

→ Old English þæctigele (compound)

→ Old Norse þak (cognate)

→ Old Frisian thek (cognate)