Being tall and interested in hobbies that are usually dominated by men.
Gendering hobbies and interests is silly, but I can't help doing it sometimes...
My mom suggested it. I thought it was the most stupid name suggestion so far, but smiled and nodded because I was happy that we were having a genuine talk about my transition without the negativity that we would often end up with.
After a few months I realized that I kinda love it and, as you say, nothing really clicked the same way. It's been about 2 years since I legally changed it and I still get a warm feeling when people use it :)
Also, nothing weird about the name Eva! If it feels weird to tell people how you came up with it, you are allowed to not mention that the idea came from a TV show.
I feel like I should have found other trans people to talk with irl earlier. I don't think I was fully ready until recently tho.