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Gladys ~ It means God's Princess from the bible, 1. Peter 2:9. An alternative meaning would be the sword used by a gladiator in Roman times.
Also I found out Gladys is a female name from the Welsh name Gwladus or Gwladys, which is of uncertain meaning. It was the name of Gwladys, a Welsh royal queen who lived in the late 5th century and early 6th century and became a Christian saint.