Boo

Boo is an English term of endearment, used colloquially to mean a sweetheart or beloved one, with possible roots in the French beau meaning "beautiful." It has also functioned as a gentle exclamation meant to surprise or startle, though in pet naming the affectionate sense wins out entirely. Pet owners who choose Boo are making a direct declaration of love — this companion is their sweetheart, pure and simple — and the name has an irresistibly soft, cozy sound to match.

Boo sits at #225 on the pet name charts and is one of the most openly affectionate names you can give a companion. It's small, soft, and sweet — three qualities that also happen to describe many of the pets who bear it. The name has a baby-talk quality that might seem too precious on paper but in practice feels completely natural when you're addressing a creature you adore unconditionally. Boo works for any pet with an especially endearing quality: the one who curls into the smallest possible ball, who blinks at you with enormous eyes, or who simply makes your heart ache with love.