A long time ago I found out something about this name. Somewhere between 2010-2012, during one of those years, 6 boys were given this name. I hope they made a mistake.
The name Princess was given to 369 girls born in the US in 2016. More than 99.9 percent of people with the first name Princess are female.
― Anonymous User 6/7/2017
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Though it has fallen out of the top 1000, 'Princess' is still unfortunately used as a first name, being given to 243 poor little girls born in the US in 2012.
Where I live it is illegal to name someone Princess since it's a title. I don't know about the English word, but I doubt they would ok it as a name since it's so similar to the Swedish word, prinsessa, and everyone knows the meaning of it.