 Maynard is the son of Peter and Donna Maynard, and has one brother, Brayden, and one sister, Karli.His father, Peter, played eight games for Melbourne between 1980–81 before playing 216 games in the SANFL with Glenelg and Woodville West-Torrens.His grandfather, Graham Campbell, played 151 games for Fitzroy and won the club's 1957 best and fairest award.