Is it possible to use 璟 for a boy's given name?
璟:ｊǐｎｇ【形】玉的光彩 (The brilliance of jade)
玉 is a neutral name, suitable for male or female. I don't see any reason 璟 would not be.
From 起名网

二、带璟字的男孩名字


(璟超)(璟竑)(璟麟)(璟然)(璟贤)(璟钰)


(璟朝)(璟鸿)(璟凌)(璟荣)(璟显)(璟煜)


........ 中略 ........


(彬璟)(贯璟)(君璟)(群璟)(夏璟)(余璟)