Reginald /regi-nald/ [3 sylls.] as a boys' name is pronounced REJ-a-nold. It is of Latin origin, and the meaning of Reginald is  ruler 's advisor.From Reginaldus, influenced by Latin Regina meaning queen. Variant of Reynold and Ronald. Popular in Britain in the 19th century.hown below is a comparison of the usage of Reginald and associated names. Ronald (#397 the previous year) , Ronnie (#755) , Rene (#796) , Ronaldo, Ronny, Ron, Reynaldo, Reinaldo, Reinhold, Reggie and Reynold are the popular related forms of Reginald (#805 the previous year) .