Elon Musk and Grimes’ baby X Æ A-12. Cameron Diaz and Joel Madden’s baby Raddix. Iggy Azalea and Playboi Carti’s baby Onyx. Three of the biggest celebrity birth announcements of 2020 have something in common.

It’s not just the X's (although that definitely is a trend in itself). It’s not just the distinctive quality of the names. It’s the fact that people can’t make assumptions from X Æ A-12, Raddix or Onyx about the gender of the child.

Side note: Here are the worst baby names Reddit has ever heard. Post continues below.

In the case of Elon Musk and Grimes, at least, that’s exactly what they intended. It’s all part of their gender-neutral parenting approach.

“I don’t want to gender them in case that’s not how they feel in their life,” Canadian musician Grimes said before the baby was born.

There are more. Lots more. Milla Jovovich and Paul W. S. Anderson called their third daughter Osian. She’s a sister for Ever and Dashiel.

“Osian is a Welsh boy’s name and it’s pronounced O-shin,” Jovovich explained on Instagram.

Meanwhile, River, which is one of the top 20 “gender-fluid” names for babies, continues to be big with celebs in 2020. It nails the environmental trend and the gender-neutral one at the same time.

Rooney Mara and Joaquin Phoenix called their son River (no doubt in memory of Joaquin’s brother), while former MAFS star Jono Pitman and his partner Rebecca Pattison called their daughter River.

More? There’s former Glee star Lea Michele and Zandy Reich’s son Ever, and singer Ciara and Russell Wilson’s son Win.