Modern spelling variant of Ryley/Rhylee, linked to meadow-place-name traditions and adapted as a trendy modern form.
Rhylei is a contemporary spelling variant of Riley, a name with sturdy Irish and Old English roots. The Irish surname form, Ó Raghallaigh, derives from the personal name Raghallach, likely meaning "courageous" or possibly connected to a word meaning "valiant in sport." The O'Reilly clan were historically powerful in County Cavan, and the name spread throughout the Irish diaspora during the great emigration waves of the nineteenth century, becoming common as both surname and given name across Ireland, the United States, Canada, and Australia.
There is also an English topographic root: Old English ryge-lēah, meaning "rye clearing" — the kind of humble agricultural landscape that grounded medieval English naming. For most of recorded history, Riley functioned primarily as a masculine surname and then as a boy's given name. The twentieth century saw it migrate steadily toward girls, and by the first decade of the 2000s it had become predominantly feminine in American usage — a pattern repeated by many surname-turned-given names like Morgan, Jordan, and Quinn.
The cultural moment that cemented Riley as a universal name for modern girls may well have been Pixar's 2015 film Inside Out, whose protagonist Riley Andersen — a sensitive, complex, emotionally honest young girl — gave the name warmth and emotional depth in the cultural imagination. The spelling Rhylei introduces a soft visual elaboration, the digraph Rh evoking Welsh naming conventions and the -ei ending giving the name a lyrical, slightly unexpected finish. It signals a family that took a name they loved and made it definitively their own.