What country of origin does Ian Day and Neil Kerley have in common?
Australian
Title: Ian Day
Passage: Ian Douglas Day (born 9 February 1935) is a former Australian rules footballer who played for West Adelaide between 1952 and 1960, and South Adelaide between 1961 and 1964.  He captained the team in 1963 and played in the 1964 Grand Final premiership under captain Neil Kerley, which was the last premiership to be won by South Adelaide.
Title: Neil Kerley
Passage: Donald Neil Kerley (born 20 February 1934 in Barmera, South Australia) is a former Australian rules football player and coach.  Known to his mates as either Neil or Knuckles and to South Australian football fans as King Kerley or simply "Kerls", he is best known for taking three clubs to four South Australian National Football League (SANFL) premierships over three decades as both a player and coach and for playing 32 state games for South Australia.  Despite his first name being Donald, it was his mother Lillian's strong dislike of shortening Christian names that led everyone calling him Neil and not Don or Donald from an early age.
Title: Neilson (name)
Passage: Neilson is a patronymic surname meaning "son of Neil".  The prefix "Neil-" is of Gaelic origin, a genitive of 'Niall', possibly meaning "Champion" or "Cloud".  Neilson, as a surname, is common in English language-speaking countries, but less common as a given name.  It can be an anglicisation of MacNeil (Gaelic: MacNeill) or the Scandinavian name, Nielsen.
Ian Day Neil Kerley