Gender neutral in english, mostly familiar forms of gender inflected names (common ones in parenthesis)
Alex (Alexander, Alexandra), Sam (Samuel, Samantha, Sam), Wil/Will (Will, Willow, Wilson, Wilhelm), Tom (Tomas/Thomas, Thomasina), Pat (Patrick, Patricia, Pattison), Mick/Mickey (Michaela, Mickey, Michael), Ron/Ronny/Roni (Ron, Ronald, Ronaldo, Ronalda, Veronica), Mo (Mona, Moses, Moshe), Ry/Rhy/Rye (Ry, Rhy, Rider, Rita, Ryland, Ari/Ary), Dar (Darren, Darline, Andar, Ander/Anders), Rue/Rube (Rube, Rubella, Ruby), Shaun/Shawn (Shaun, Shawn, Shawna, Shoshanna), Vic (Victor, Victoria, Vicky), Davy (David, Davionne/Davyonne), Andy (Andrew, Andrea, Ander/Anders)
Soren/Søren/Sören is masculine in Scandanavian tongues, but Soren has some use as an English female name in the late 20th C... of the 3 Sorens I went to school with, one was female, but she did use a y - Sorynn.).
Likewise the Celtic male Sian/Ṡian has become gender neutral in English, pronounced both as shawn and as see-an. The feminine Sionna/Ṡionna is seldom used in US english, but I've seen a number of British Sionna's, one of whom went by Shawn.
Shane is usually male, but not entirely - I've seen one female student with it, and the show Space: Above and Beyond had a female character named Shane.
Jen (from Jennifer) is commonly female in English, but seems to be a fairly common european male name in both Jenn and Jens forms... but the pronunciation is different
Michel/Michelle - seems to be genderless in French (including Cajun and Qebeçois), but in English is usually female.
An unusual but legit english pairing: Tam (Tamerity, Tamara, Tammy)
Sue or Su is apparently genderless in Hmong, Thai, and Lao families (I think it may in fact be an ordinal), but commonly female in English (Susan, Susanna, Sue), tho' the occasional male Sue in English is known.
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