Charles Fielden (not sure about middle name) Mudgway

Charles is my Gt Gt Grandfather. He is the Grandson of an early settler family, the Mudgway's. It's time to spend a bit of time on my mother's line, especially while I'm living in the UK.

Charles Fielden MUDGWAY
Born: 1892 in Wellington, New Zealand (NZBDM: 1892/2147)
Died: 1969 in New Zealand
Awaiting birth and death certificates from NZIA

Charles, known as Charlie, died not long before I was born, so I don't know much about him and my poppa died before I really became interested in my family tree. My interest originally stems from a set of 3 A4 sheets of paper that are a photocopy of the Richard Mudgway (Muckaway) & Ann Wilson line. I have had this for as long as I can remember and have always looked at it and wondered. For some time I have just assumed it is correct, not actually checking the information. There are many Mudgway family historians, as we have a rather large family. But now it's my turn to find the actual evidence behind this tree and to extend it to include the current generations where family members will allow.

Questions: Why was Charles' middle name Fielden, where did this come from. I was always under the impression that Emily (his wife) added it on the death certificate, except now I can find a birth record for Charles Fielden Mudgway. Hence my question (to myself) where does the Fielden come from. Emily, although she is a Fielden, didn't arrive in New Zealand till after 1911. Her family arrived together and I do not believe that any of her relatives were here earlier. But this begs the question, why did the Fielden's come to New Zealand. Maybe there is more Fielden family in New Zealand and Emily and her brother and sisters came to live with them. More investigation is required.

Parents:
Charles is born to parents Lewis Mudgway and Mary Hawkins. I'm not going into any more detail with regards to Lewis and Mary, this would become another post.

Siblings:
Charles has the following brothers
Herbert Lewis B:(NZBDM: 1893/6883)
M:(NZBDM: 1917/6035 to Jessie Allen
D:(NZBDM: 1962/42755)

Alick B:(NZBDM: 1895/2940)
M:(NZBDM: 1918/2936 to Elsie Florence McDonald - I have a piece of paper that has Alick married to Clara Huggad (spelling?)
D:(NZBDM: 1993/46843 (Birth date from Death 6/3/1895))

Royston Albert B:(NZBDM: 1901/14775) Father spelling Louis
D:(NZBDM: 1901/2030 7 Days Old)

Claude Mudgway B:(NZBDM: 1903/15730) NZBDM has Mudgway as both his middle name and his last name
M:unknown
D:(NZBDM: 1985/39079) Birthdate from death record: 3/12/1902

Roysten William B:(NZBDM: 1906/22984)
M:(NZBDM: 1931/7483 to Hannah Beatrice May Mountain
D:(NZBDM: 1965/39250)

Further Ramble:
Upon looking up the birth index for New Zealand on Ancestry.com, I was able to find a Charles Mudgway born in 1892. Note no middle name. But the birth Index 418 when searched on the NZ BDM website comes up with a William George Wade, which is obviously incorrect. But maybe the filio number isn't for the BDM website, it could be something else. Interesting that there is no middle name. I have also found a marriage index on Ancestry for Charles Mudgway, which is the year he marries Emily and the folio number matches the marriage index for Emily Ashworth Fielden. I have found a Charles Mudgway that died in the war, that is listed on an Ohau School Honor Roll. This is not my Gt Grandfather as he died in 1969 and I'm not sure that he actually went to war. I was under the impression that because he was a farmer, he got to stay home. I also checked the NZIA historical marriage records, Charles Mudgway married Emily Ashworth Fielden, again no middle name. More and more evidence is pointing to the rumour my Gt Grandmother adding Fielden to his name. The birth certificate will provide more light. It has been ordered.


Marriage
Charles marries Emily Ashworth Fielden in 1914 (NZBDM:1914/2890) Record does not have a middle name for Charles.

Researching:
1: Why Charles' middle name was Fielden
2: Why Emily's family came to New Zealand, was there other family here?