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by DanBC 3363 days ago
Debretts is probably the place to find this out.

Here's the rules for putting the letters after names: https://www.debretts.com/expertise/forms-of-address/letters-...

The Joint Forms of address gives you some clues about the order of words before the name: https://www.debretts.com/expertise/forms-of-address/joint-fo...

Note that most people don't know about this stuff, and don't really care about it.