April ranks at #395 with 313 entries, leaning female. Calendar-month names are a small but persistent register in pet naming, and April is the most common of them. The name's softness, the spring associations, and the fact that some pets are actually born or adopted in April all contribute to its volume.
The month-name register
April clusters with May, June, Autumn, and Summer in the calendar-and-season-name pet cohort. A meaningful subset of owners pick the name because the pet was born or adopted in that month, which gives the choice a personal anchor that other naming registers don't carry. The April baby name page shows the SSA chart peaking in the 1970s and softening since.
The Parks and Recreation layer
April Ludgate (Aubrey Plaza, 2009-2015) on Parks and Recreation gave the name a contemporary deadpan-comedy register that some millennial owners engage with deliberately. Cats picked under this reference tend to be the unbothered, mildly judgmental sort that look like they have opinions about your life choices. The character's fingerprints show up subtly in pet-naming patterns.
Sound and breed fit
The two-syllable shape (AY-pril) has an open front vowel and a soft trailing consonant, projection-friendly without being sharp. April lands across breed sizes but over-indexes on cats and small-to-medium dogs with calm temperaments — Cavaliers, Cocker Spaniels, mixed breeds, and laid-back companions where the soft seasonal name suits the pet's presence.