Seanna is a modern feminine form of the Irish name Seán, ultimately deriving from John. The name John has Hebrew origins meaning "Yahweh is gracious," and was introduced to Ireland through the Latin Iohannes. Seán itself became common in Ireland, and its feminine counterpart Seanna emerged in the English-speaking world, particularly in the 20th century, as a distinctive variant. The name reflects the broader tradition of adapting Irish names for modern usage, notably seen in similar forms like Shawn and Shavon. Seanna connotes grace and divine favor through its root meaning, and shares cultural links with the widespread legacy of John in Christian tradition, including numerous saints, popes, and monarchs.