Cavalier or messenger
A modern phonetic spelling of the English surname Ryder. It originates from the Old English word 'ridere', which historically referred to a mounted messenger or a forest official who patrolled on horseback.
Less common today
Rhyder isn't in the latest US Top 1000. It last peaked at #1,587 in 2013.
A character in the video game series Β· Mass Effect: Andromeda
US births per 5-year period, 1990βpresent (SSA data).