I am surprised that the Welshman used vowels, i.e., Rees vice Rhys, but hey Crymu is a difficult languauge to understand because some consonants sound like vowels and I think if I remember my third grade teacher Mrs. Wolf right, a,e,i,o,u, and sometimes y, and w. Surely she was speaking of the Welsh.
Add to your list the word "atte". I have this in my family. My mother's surname Wood was "Atwood" which was corrupted over the years from "atte Wode"; the atte meaning "from the" or "of the" as the modern German "von" meaning "from". The double "o" as in "das Boot" in German is pronounced as a long "o" The atte is from Saxon or more properly Sachen and is old English which is really Platz (low German, meaning "lowland", not vulgar) Deutch any way. There was an attempt by Henry VIII, or maybe it was his father or grandfather, to force the Scots and Welsh to adopt the Anglo-Saxon form of taking a surname, that of the lands on which they were born or the city where they were born. Being Scots and Welsh (foreigner, a name given to the Welsh by the Saxons) they of course refused to do so, opting instead for their traditional "ap" and "Mac". When the Normans arrived the brought with the "Fitz" which I believe is "son of" as well, so all those FitzPatricks and FitzHughes running around declaring their "Greeness" and wanting the British out of Ireland...well they are Normans, the ancient conquerors of Ireland, a title inherited by todays Brits.