Welsh twll

← Proto-Celtic *tullom (derived)

← Proto-Celtic *tullos (mention)

← Irish toll (cognate)

← Proto-Indo-European *(s)tewk- (derived)

→ Catalan toll (cognate)

→ Welsh twll yn y wal (compound)

→ French Toulon (cognate)

→ Irish toll (cognate)

→ Galician tol (cognate)

→ Galician atolar (cognate)

→ Galician atol (cognate)

→ Galician tola (cognate)

→ Latin Toletum (cognate)

→ Portuguese atolar (cognate)