Merlin ranks at #632 with 195 entries, registered male. The name is the wizard-character anchor in Arthurian legend, and on a pet registry it lands on dogs and cats given a deliberately mythic register. Owners reaching for Merlin are usually picking the magical-old-man image on purpose.
The Arthurian lineage
Merlin appears in 12th-century Arthurian texts (Geoffrey of Monmouth's Historia Regum Britanniae, around 1136) and has been the default English-language wizard archetype ever since. The character has been carried into modern visibility by T.H. White's The Once and Future King, the 1963 Disney film The Sword in the Stone, and the long-running BBC series Merlin (2008-2012). The cultural anchor is unbroken across nine centuries.
The fluffy-gray-coat naming logic
A meaningful share of registry Merlins are dogs and cats with gray, silver, or wizard-beard-coded coats: long-haired gray cats, silver Schnauzers, salt-and-pepper rescues. The naming is direct visual reference to the wizard's traditional white-and-gray beard, and the breed concentration follows the visual trigger.
Breed lean and sound
The name lands on a wide range with concentration on coat-color-matching breeds: Schnauzers, Poodles, Persian cats, and silver-coated mixed breeds. Two syllables, front-stressed (MUR-lin), with a soft trailing N that keeps the name from sounding harsh. The human Merlin page shows minimal SSA presence; pet Merlin owns the cultural space without competition. Browse the broader pet name index for adjacent mythic picks.