... try it out and let us know

Sure… Walter is a regular first name, and there’s lots of people with the last name Disney. It’s from “de Ysini”, and lots of people lived and live in the Ysini region. Company is from the French compagnie, from Latin companio, where we also get companion.

So “Walter of Ysini, Friend” AKA “Walt Disney Company” is a perfectly legitimate name.

As is Michael Mouse.

Excluding laws in certain places meant to protect children from a life of ridicule, you can name your child whatever you want.

The issue of trademark, which is what this article highlights, only concerns applications where there is a business conflict. For example, it is normal for an actor/musician/artist to trademark their name as their "brand," which means I can't just form a thrash metal band called "Taylor Swift" to profit off of some confused music listeners. And even if my legal name was Taylor Swift, I could still be required to change my "stage name" to something else when promoting myself as an artist to avoid any confusion/conflict with Tay-Tay.

Last I checked, Warner Bros is not in the passport industry, so this is a dumb argument that should never have occurred. If I had to guess, it was probably just some random disgruntled government employee who felt the need to play armchair activist and "punish" a parent because they didn't like the name they chose for their child.

Absolutely... Will Disney likely sue you into oblivion? Most likely.