Alexander ranks at #885 with 132 entries, registered male. The name is Greek, from Alexandros meaning defender of men, and carries the weight of Alexander the Great's empire-building reach. On a pet registry the full-form Alexander is the deliberately-formal choice — owners who wanted Alex picked Alex; owners who pick Alexander are committing to the four-syllable register.
The formal-full-name register
Alexander sits with Maximus, Sebastian, and Theodore in the deliberately-stately male pet pocket. The naming logic is unironic dignity: the dog as the household's serious gentleman, registered with the full given name and rarely shortened in daily use.
Breed lean and sound
The name lands hardest on substantial dignified breeds — German Shepherds, Standard Poodles, Great Danes, and large pedigreed mixes. Four syllables, second-stressed (al-eg-ZAN-der), with the rolling sequence giving the name commanding weight at full pronunciation.
The counter-reading
The honest consideration: four syllables is long for daily recall. Most Alexander pets get called Alex, Lex, or Xander in practice, which means the formal register only lives on the registry form and at the vet. For households who like that distinction, it works. The human Alexander page shows top-tier SSA presence, holding steady in the top 25 for decades.