Felix

Also Romansh:
Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars
https://sursassiala.ch/2015/01/15/familienforschung/
https://www.portraitarchiv.ch/portrait?page=75

Also Finnish name. Finnish name day September 6.
https://fi.wikipedia.org/wiki/Felix
https://almanakka.helsinki.fi/en/name-days/name-day-search.html

Also Estonian: https://et.wikipedia.org/wiki/Felix

Also Czech: https://krestnijmeno.prijmeni.cz/search.php?name=Felix&t=1

In 2018, 2 is the most common age for an American (U.S.) Felix who is registered male with the Social Security Administration. It is the 896th most common male first name for living U.S. citizens.

I named my daughter Felix June-Olivea. I get complements on how cute her name is everyday. Modern yet old fashioned. It fits her so well. We call her Fí for short. I love her name, best choice I made. My mom hated it, but now she loves telling everyone her granddaughter's name means happy beautiful beginning.

I think this name is great for humans, but it seems to be used primarily for pets, particularly cats. (My grandma had a cat named Felix and my daddy called him "Flea-lix.")

Also Spanish.

Felix is normally used as a man's name, but I discovered that my great-grandmother Maria was known as Felix Maria on her marriage certificate in 1880. Very strange!

This name is extremely popular in Germany.