Bernard Maltais??

..Steve Owen1..

While that may indicate some kind of "managed system" or computer had been used

from or within a networked other computer; associated with your wife's iMac; the

management (if that's the case) could be removed, by correct actions taken.

Intro to mobile device management - Apple Support

"Configuration profiles automate the configuration of settings, accounts,

restrictions, and credentials. These files can be created by an MDM

solution or Apple Configurator, or they can be created manually."

Details where this was found:

Bernard: corporation wiki shows 156 connected affiliations, each is secure.

If corporate or personal 'systems management' is the case, erasing the storage/drive

may not remove all files behind this. One of the cures might involve deeper erasure.

Instructions to remove an Apple management system are in the Table of Contents

link; among many other bits about this. (An internal discussion within ASC had a

few links on this, there in closed to public view; & had been read with curiosity.)

• Intro to MDM profiles
• Intro to MDM payloads
• About device supervision

This applies to a 'user-level' and/or 'corporate-business' level. And does not affect

a user-level account; they can login, and do anything in the computer, normally.

•Deployment Reference for Mac - Apple Support

Apple Platform Deployment [Table of Contents] - Apple Support

//support.apple.com/guide/deployment/toc

User Enrollment MDM information - Apple Support

//support.apple.com/guide/deployment/user-enrollment

..If the computer had been bought second hand, as new; it may

have been associated with anyone whose personal or business

might have had reason for the Apple Management system in it..

Just saying, this is one explanation; with varying implication!🤔

Hard to say why your wife's iMac may show a name of someone in Houston TX

who has any affiliation with Royal Bank of Scotland Group PLC; unless a known

connection may exist. (As a corporationwiki.com/texas/houston page shows.)

That however is not something a Volunteer helper in an Apple 'User-to-User'

community online might begin to guess. What I found: in duckduckgo search.

[Unless the computer or user associated with the iMac had been corporate

owned and later sold but not released from ADM or management protocols.]

Perhaps the reply from Old Toad at the link below will shed some light.

Bernard Maltais - Apple Community