Blue

Blue as a name comes from the Old English and Old French bleu, referring to the color that has symbolized calm, depth, and loyalty across cultures for centuries. In heraldry, blue represented truth and steadfastness. As a pet name, it tends to be chosen for companions with blue-gray coats — blue heelers, grey cats, silver-furred animals — though its cool, confident sound makes it attractive regardless of the companion's coloring.

Blue sits at #38 among US pet names, with nearly 1,900 companions sharing it. The name has a relaxed authority that feels distinctly modern. It's the kind of name that sounds great in every context — called sharply across a field or said softly during a quiet evening. Blue has been further boosted by celebrity usage, most notably Beyonce and Jay-Z naming their daughter Blue Ivy, which sent the name into cultural prominence and carried it naturally into pet naming. It remains one of the coolest single-syllable pet names in use.