How to change language setting in my iPhone?

Remains a mystery. My phone Region setting are USA and Languages are English, Swedish and German. No Spanish. My wife whose phone I often looking for, does speak Spanish. But she too is complaining that her phone is showing more and more Spanish. I'll have to examine her phone when she gets back as her phone may be the culprit. That would still be odd though because the Spanish is before I can log in to anyone's phone.

But you gave me an idea about VPN that may point to the root cause. I have NordVPN on my phone that I rarely use. But even there Spanish or any country associated with a Spanish language is not any of the regions I have ever conected to or in my profile. But as soon as I conencted to a US VPN server, boom, my iCloud login page went to English.

The plot thickens. iCloud is in Spanish when I use the Find My on my iPhone. Choosing iCloud in a browser is in English. On my laptop it is English. Region is United States. Language(s) there are three there and none are Spanish.