 Regarding Merryn son of Brychan, in his 1965 book series "The Saints of Cornwall" the scholar Gilbert Doble disputes assertions made by Charles G. Henderson that the Merryn in question may have been the "Marwenna found in William of Worcester's list of the Children of Brychan"

The benefice of St Merryn was named Vicaria Sancte Marine (the vicarage of St Marina) in 1259.It continued to be listed in church records as a form of Saint Marina until 1477 when it was named Seynt Meryn.There are two churches in France named after a Saint Marina or Marinus