Percy or Perce?

[FlamingStar Chows]

No: HPFGUIDX 52727

Seventh Squeal (lovely name!) wrote:
<< Percy Weasley was named after Percival the knight who went to seek
the grail. >>

Catlady (Rita Prince Winston) wrote:
I don't have canon evidence, but I strongly believe that Percy's name
is Percy, not Percival, so in effect he was named after the family
name of the Earls of Northumberland, who IIRC had a big army and were
practically kings themselves during The Wars of The Roses. A good
reason (what this USAmericans thinks a good reason) would be if
Percy was Molly's maiden name.

Me:

I have a question that has been bugging me...I haven't seen it discussed and
I couldn't find it in the Archives.  I'm wondering if there is a reason for
this or if it is just poor editing....most of the time Percy's name is
spelled "Percy", but other times it is spelled "Perce".  It seems like GoF
(I have the American hardback 1st edition) was where I noticed it the most,
and it just drove me nuts.  I was looking for a pattern...it seemed to be
spelled "Perce" most often when another family member was speaking to him,
but that wasn't the case all of the time.  Anyway, can anyone tell me if
there is a legitimate reason for this?

~Cathy~