Susy is the phonetic spelling of Susie, which itself is the classic diminutive of Susan. At rank 1933 with 52 records, this is almost certainly a registry artifact — owners who wrote the name as they say it, without defaulting to the standard Susie spelling. The name lands in an interesting generational pocket.
The Susan Family Tree
Susan peaked as a baby name in the 1950s–60s, which means the human Susies and Susans of America are now grandparent age. Pet owners who choose Susy or Susie for their dogs are frequently paying tribute — to a grandmother, a beloved aunt, or simply an aesthetic of mid-century American warmth. The human name Susan carries that nostalgic weight effortlessly.
Sound and Practical Use
Two syllables, hard S start, soft close — SOO-zee is a name that dogs learn quickly. It carries well across a backyard and doesn't blur with common commands. For Cavalier King Charles Spaniels and other gentle, lady-of-the-house breeds, Susy fits the aesthetic like a lace collar.
Counter-Reading: Spelling Ambiguity
Susy will be corrected to Susie by nearly every vet receptionist and groomer. That's a minor friction that owners accept when they choose the phonetic variant. It also means the name's registry count is split across multiple spellings, making the true number of dogs answering to SOO-zee considerably higher than any single variant suggests.