From the gemstone name, derived from Latin 'rubeus' meaning 'red'.
Ruby comes from the name of the gemstone, which in turn derives from the Latin ruber, meaning “red.” Like Pearl, Opal, and Jade, it belongs to the family of jewel names that moved from objects of beauty into the nursery. The stone itself has long been prized for its vivid color and perceived virtues; in different traditions, rubies were associated with love, vitality, nobility, and protection.
When the name Ruby entered regular use in English, it carried all that brilliance with it. Ruby became especially popular in the English-speaking world in the late 19th and early 20th centuries, when Victorian and Edwardian parents embraced floral, virtue, and gem names. It could feel both ornamental and robust: bright red is not a shy color, and neither is Ruby.
The name also gathered richer cultural associations over time. Ruby bridges sweetness and force, from jazz and blues echoes to the civil rights story of Ruby Bridges, whose courage as a child made her one of the most important American bearers of the name. In literature and song, Ruby often appears as vivid, affectionate, and memorable, a name meant to catch light.
After a mid-century lull, it returned strongly in the 21st century as parents rediscovered antique names with warmth and sparkle. What makes Ruby enduring is its clarity. It does not hide its image or its feeling. It is jewel, color, and personality all at once: lively, affectionate, and impossible to mistake.