Custom Naming Formats

Custom Naming Formats

Hello!

Is it possible to create following naming format:

Firstname: John
Lastname: Smith

Username: SmithJo

If the sAMAccountname SmithJo is already taken, I want it to be SmithJh, so the first an third letter of John?
I know that I could append a number, but this wouldn't fit in the existing naming convention.

Best regards 
Chris

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