Visenya is a modern fantasy name popularized in literature, with no traditional etymology but a regal, invented feel.
R. Martin for one of the most formidable figures in the fictional history of Westeros: Visenya Targaryen, elder sister and wife of Aegon the Conqueror, who rode the great dragon Vhagar during the Targaryen conquest of the Seven Kingdoms roughly three hundred years before the events of A Song of Ice and Fire. Where Aegon's other sister-wife Rhaenys was famed for warmth and charm, Visenya was warrior, tactician, and founder of the Kingsguard — the elite royal bodyguard whose oath and white cloaks endure through the entire saga.
Martin drew her name from the constructed Valyrian language family he developed for the series, giving it the characteristic hard consonants and open vowels of that fictional tongue. The Valyrian phonological system — as developed further by linguist David J. Peterson for the HBO series Game of Thrones — tends toward names that feel simultaneously Latin, Ancient Greek, and entirely invented.
Visenya shares with names like Daenerys, Rhaenyra, and Aenys a quality of plausible antiquity, as if these might be names from a lost civilization rather than pure invention. This verisimilitude is part of Martin's genius as a world-builder. The HBO series Fire & Blood (House of the Dragon) brought renewed attention to Visenya's legacy in the prequel storyline.
For parents seeking names outside the historical record, Visenya offers considerable appeal: it is strong and multisyllabic, carries heroic fictional associations with a female warrior-founder, and sounds unlike anything in conventional naming traditions while remaining easy to pronounce. It represents a growing category of literary names that parents choose to honor a fictional lineage the way prior generations honored saints.