Reginald \r(e)-gina-ld, regi-nald\ as a boy's 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. Actor Judge Reinhold; baseball celebrity Reggie Jackson; theologian Reinhold Niebuhr.

Reginald has 37 variant forms: Naldo, Raghnall, Rainault, Rainhold, Raonull, Raynald, Rayniero, Reg, Reggie, Reggy, Regin, Reginaldo, Reginalt, Renato, Reginauld, Reginault, Regino, Reginvald, Reginvalt, Regnauld, Regnault, Reinald, Reinaldo, Reinaldos, Reinhold, Reinold, Reinwald, Renaud, Renault, Rene, Reynaldo, Reynaldos, Reynold, Reynolds, Rheinallt, Rinaldo and Ronald.

For more information, see also related names Ragnar, Raines and Ren.