Una is a name of genuine literary depth appearing in Spenser's The Faerie Queene as the embodiment of truth, derived from Latin and Irish roots for one and unity. On a pet it carries a quiet elegance that doesn't announce itself: a name you notice after a moment rather than immediately.
The Literary Pedigree
Una in The Faerie Queene (1590) is accompanied by a lion, making the name unexpectedly perfect for a large dog or an imperious cat. In Irish tradition, Una is an ancient name with connections to hunger or longing, though the unity interpretation is more commonly cited. Irish Wolfhounds and Whippets suit Una's refined, slightly otherworldly quality.
Sound and Simplicity
YOO-nah (or OO-nah) is two syllables, small and complete. It doesn't shorten naturally, meaning what's on the registration is what gets called. The human name Una is rare enough in the US to feel distinctive without being invented.
Counter-Reading: Pronunciation Split
Una has two equally valid pronunciations: the Latin YOO-nah and the Irish OO-nah. Owners will encounter both questions. Settling on one and being consistent avoids confusion. Browse other short elegant pet names in this register.