Rhydderch

Rhydderch or Riderch is a Welsh male given name being a compound of the elements "rhi" (ruler) and "derch" (exalted). Earliest mentions of the name are:

• Riderch I of Alt Clut (Rhydderch Hael) (fl. 580; died c. 614)
• Riderch II of Alt Clut (fl. early 9th century)
• Rhydderch ap Dyfnwal (fl. 971)
• Rhydderch ap Iestyn (died 1033)