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| -au | tad | tadau | vader |
| -iau | cot | cotiau | jas |
| -on | meddyg | meddygon | dokter |
| -ion | ysgol | ysgolion | school |
| -i | ffenestr | ffenestri | venster |
| -ydd | afon | afonydd | rivier |
| -edd | ewin | ewinedd | nagel, klauw |
| -oedd | dinas | dinasoedd | stad |
| -ed | merch | merched | meisje, dochter |
| -od | llew | llewod | leeuw |
| -iaid | Morgan | y Morganiaid | de Morgans, de familie Morgan |
| -aint | gof | gofaint | smid |