most definitely it has a cultural convention. Spelling ''errors'' are fairly modern in concept, particularly in relation to names of persons. Take the names Smith, Smythe, Schmidt... all variations on a theme, have seen one man's name go from Schmidt to Smith in this province, he was German in origin, settled here in late 1700s, the first few records had it Schmidt, then there was a change of priest in the parish and it became Smith in records. He couldn't sign his name so obviously illiterate, didn't bring any corrections to the record. The children eventually all got named Smith later in life.