The Girl Name That Became a Boy Name: How Names Change Sex

Open the gender-compare view on almost any old name and you will find a surprise in the other column. Ashley was a top-100 boy name through the 1940s before becoming the number-one girl name of the late 1980s. Leslie, Shirley, Arlene and Marion all crossed from male to female. Evelyn and Hilary did the same. The reverse current is newer but running fast: Ryan, Austin, Taylor and Jordan went from mostly-female or balanced to solidly male within a generation or two, and today the fastest-growing girl-name patterns borrow heavily from surnames that read masculine — Harper, Piper, Parker, Riley.

Historically the flow had a direction. As women entered professional life in the mid-twentieth century, families moved girls off the soft diminutive -ie and -ette forms and onto names that read as neutral or serious — a pattern sociologists have argued still shapes the parental instinct that a girl can handle a unisex name while a boy cannot. That asymmetry is visible in the raw counts: at every point since 1960, there are far more top-100 girl names with meaningful male usage than the reverse. But the last decade genuinely loosened the boy side — the unisex names chart on this site exists because thousands of families now choose it.

The practical question most parents ask is the wrong one. Is this name unisex is a snapshot; names are movies. A name that is ninety-ten today can be sixty-forty in fifteen years, or can harden. Look at the slope: on this site, compare the ten-year trend of the name in both columns. A name whose male count is climbing while its female count holds is mid-flip; one that fell out of the other column entirely is hardening. Choosing from the slope, not the snapshot, is how you avoid naming a child into a transition you did not expect.