Likely a surname-style modern name, probably related to Slater, an occupational name for a roofer using slate.
Slader is an uncommon given name with the texture of an English or possibly Germanic surname repurposed as a first name — a naming pattern with deep roots in British and American tradition, where family names, occupational names, and place names have long crossed over into given-name use. The surname Slader appears in English parish records going back several centuries, likely derived from a place name or a topographic term. Some researchers connect it to Middle English or Old English roots suggesting a valley or a slope — terrain-descriptive surnames that were common in medieval England as identifiers of where a family lived.
The practice of using surnames as given names accelerated considerably in nineteenth-century America and Britain, where it became fashionable to honor maternal family lines or distinguish children within large families by giving them surnames as first or middle names. Names like Fletcher, Spencer, Parker, and Hunter followed this same path from occupational surname to mainstream given name. Slader, being rarer, never completed that mainstream journey but persists as a distinctive choice for parents drawn to its strong consonant sounds and singular quality.
Phonetically, Slader has an appealing ruggedness — the initial 'sl-' cluster, the long 'a,' and the crisp 'd-r' ending give it a clean, decisive sound reminiscent of names like Sloane, Thatcher, or Grader. In an era when parents increasingly mine surnames, place names, and archaic vocabulary for distinctive first names, Slader occupies an interesting space: genuinely rare, phonetically strong, and carrying the weathered authenticity of an old family name waiting to begin a new chapter.