Good question!
I was just looking into this regarding name changes in the USA. Only one of the agencies even has a way to directly change a name. Instead, they collect data from creditors including when someone changes the name on an account, and they just add that as an alias.
I gather this makes a short term hit on a credit score, just because people sometimes try to evade debt with a name change. It also means that it can be hard to truly go stealth as someone pulling a credit report will see the old names.
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