Dwyfor, Dwyfawr, [443].

dwyn, dwg, [649].

Dwynaur, [443]: see Dwyfor.

Dwynech, [443]: see Dwyfach.

Dwynwen, St., 367.

Dyaus, [642], [644].

Dyfed, Dyved, 152, [499], [500], [505], [525], [548].

Dyfi, [614]: see Dovey.

Dyffrydan, 243.

Dyffryn Gwyn, 143.