Gruffudd Fychan I died in 1289.
Gruffudd Fychan II died in 1369.
Simwnt Fychan died in 1606.
Ednyfed Fychan died in 1246.
His parents were Gruffudd Fychan (d. by 1370) ap Gruffudd ap Madog ap Gruffudd Fychan (d.1289) etc and Elen ferch Thomas ap Llywelyn ab Owain ap Maredudd etc. He and his father were lords of Glyndyfrdwy (along the Afon Dyfrdwy - River Dee - near Llangollen) in Meirionethshire and of Cynllaith Owain (around the Afon Tanat) in what is now Powys. See 'The Last Mab Darogan' pp.47-52.
Llywelyn ap Gruffydd Fychan died in 1401.
Gruffudd Llwyd died in 1410.
Gruffudd Hiraethog died in 1564.
Gruffudd Vychan died in 1447.
Ioan Gruffudd was born on October 6, 1973.
Welsh actor Ioan Gruffudd is 44 years old (birthdate: October 6, 1973).
Ioan Gruffudd wasn't in charmed, but in season 8 Agent Murphy was played Brandon Quinn who looks very much like Ioan Gruffudd.
Yes it's derived from Welsh but in Welsh it's "Fychan".