Alex is commmonly a short form of both Alexander and Alexandra… though I have no doubt that some of the people named “Alex” were actually christened with the short form (I know a chap named “Lex” where that is the full form of his given name).
I opined “boy or girl” for Alex up-thread – my son is named Alexander (and goes by Alex), and within my circle of friends there are several girls with Alexandra as a name (mostly as a middle name as it happens).
And Alexandra is not a recent decades name, but rather one dating to Roman times, and – so wiki informs me – was an epithet of the goddess Hera. (I did not know that…)
The actress / model James King might be surprised at your assertion… though as she goes by Jaime now…
Robin - Girl, though I went to school with a boy named this.
Terry - Boy with a “y”. My sister is Terri.
Kelly - Girl. My best friend. I’ve known boys.
Shannon - Girl, though I know a couple of guys.
Tracy - See Shannon
Tony - Boy with a “y”, girl = Toni
Jody - Boy… This is my Brother’s name.
Sidney - Girl
Courtney - Girl
Hilary - Definitely girl
Alex - Either
Jamie - Either
Erin - Girl with this spelling, though I work with a guy who spells his name this way.
Qbert - Video game… Boy. I think I even played that a few times.
Robin - Male
Terry - Male
Kelly - Female
Shannon - Female
Tracy - Female
Tony - Male
Jody - Female
Sidney - Female
Courtney - Female
Hilary - Female
Alex - Male
Jamie - Female
Erin - Female
Qbert - Robot
Robin - Bird
Terry - Coma
Kelly - Female
Shannon - Female
Tracy - Devin Townsend’s wife
Tony - Male from New York
Jody - Female
Sidney - Australia
Courtney - Female
Hilary - Female
Alex - Male
Jamie - Female
Erin - Female
Qbert - Meep?
American here, and Erin and Aaron also sound different. For me, they differ in both vowels. In fact, I believe there are four different vowels total, or that’s what I hear when I think of the names.
All of these names could certainly be both, except perhaps Courtney and Hilary - I can’t think of any male Courtneys or Hilarys. Erin should definitly be a girl, with the boy’s version spelled Aaron, or maybe Arin.