Renier \r(e)-nier\ as a boy's name is a variant of Raynor (Old German), and the meaning of Renier is "deciding warrior".
The baby name Renier sounds like Ranier and Reinier. Other similar baby names are Kenner, Lanier, Reiner, Regner, Rainier, Renke, Raynier, Ranger, Raniero, Ranieri, Rene, Renne, Rennie, Senior and Tanier.