Yvaine is a modern coined name by Neil Gaiman — derived from Old French yvaine (evening star) and the Welsh name Yvain (a knight of King Arthur's Round Table). A modern revival name from contemporary fantasy literature. Yvaine — central character of Neil Gaiman's Stardust (1999 novel; 2007 film adaptation directed by Matthew Vaughn); the fallen star who becomes the romantic lead, played by Claire Danes in the film opposite Charlie Cox; the film grossed $137 million worldwide on a $70 million budget and developed cult-classic status; novel was illustrated by Charles Vess and won the ALA Alex Award (2000). Yvain (Owain mab Urien) — Arthurian knight; protagonist of Chrétien de Troyes's 12th-century Yvain, le Chevalier au Lion — one of the Arthurian romances; Yvaine is the feminine variant. The evening star in classical mythology is Venus / Hesperus.
Yvaine does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
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In Pythagorean numerology the letters of Yvaine reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.