Tillyard may be
Aelfrida Tillyard, author and religious figure E. M. W. Tillyard, classical and literary scholar H. J. W. Tillyard, classicist, Byzantinist and musicologist Robert John Tillyard (1881–1937), entomologist Stella Tillyard, author
See also Tillyard's skipper (Anisynta tillyardi), a butterfly species Tillard Tiltyard