First name from Matthew Cox in an email dated 3 June 2018. Matthew is the grandson of Grace Elizabeth McKoy (b.1887).

Second name, year and country of birth from official Birth Records search on New Zealand BDM website in June 2018:
1912/6263, Cox, Hilton Ralph, Mother: Grace Elizabeth, Father: William Charles

Place of birth, date and place of death, from:
https://www.findagrave.com/memorial/127725726/hilton-ralph-cox

Year and country of marriage from search on New Zealand BDM website in January 2019:
1937/11323. Bride: Ellen Lucy Lester. Groom: Hilton Ralph Cox

Full date of marriage of 20 November 1937 from further searching in January 2019 on BDM Search by incrementally changing the date range for the marriage.