Variant spelling of Gladys, from Welsh 'Gwladys,' possibly meaning ruler or princess.
Gladus is a variant spelling of Gladys, from the Welsh name Gwladys, which is often interpreted as meaning ruler or princess. The name belongs to an older Welsh noble naming tradition and carries a sense of status from the start. Its spelling shifts the familiar shape into something slightly leaner and more direct, but the noble resonance remains intact.
Gwladys has long been associated with Welsh history and legend, and Gladys became the more familiar English spelling over time. The name was especially visible in the late nineteenth and early twentieth centuries, when many medieval or regional names entered broader English usage. Gladus preserves that lineage while sounding a little more archaic or variant-like than the standard form.
The -us ending gives it a firmer, more closed finish that makes it stand out from Gladys without breaking with its heritage. In modern use, Gladus feels rare, dignified, and somewhat old-world. It has the warmth of a familiar historic name but the oddness of a spelling that is not commonly encountered.
That makes it attractive to people who like names with a medieval or regional flavor but want something less expected than the standard form. Gladus sounds as though it has stepped out of a family register or a local history, carrying quiet status in a compact package.