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Alex on a girl is usually short for Alexandra or Alexandria, Alexa is short enough already that no one really shortens it to Alex (but they do sometimes shorten it to Lexi/Lexie/Lexy.)
I've never actually met a Seamus (US) but I've met a lot of girls named Shay, Shae, and elaborations like Shaya, Shayna, and Shayana.

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I like Wren, Kalani, Tristen, Robin, River, Morgan, and Devin. I would like Sinclair if it didn't remind me of the petrol company.

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How I'd group these names:
Male - Carl, Andy, Tomison, Ashton, Aston, Blair, Blake, Brook, Chandler, Coby, Dallas, Darian, Dylan, Davis, Jaden, Sinclair, Robin, Reign, Ricky, Riley, Leigh, Logan, Mickey, Kirby, Kevin, Parker, Teddie, Toby, Tristen, Windsor, Murphy, Lake
Female - Wren, Kalani, Shay, Brooke, Brandi or Brandy, Camryn, Paris, Page, Haven
Unisex - Alex, Skyler, Jamie, Joss (on a girl I'd expect it to be short for Jocelyn), Morgan, River, Kennedy, Devin

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(I have met people with names outside this list-- I've seen girls named Blake, Logan, Parker, and Mickey; Paris, Robin, and Kalani are really unisex; etc. but this is how I instinctively categorize these names. Cameron would be unisex or male but Camryn is definitely one of those American "feminizations" with a random y.)

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I've never heard of Derby or Sebby. I've met a few girls named Darby, and I'd guess Sebby was short for Sebastian so probably male.