Isn't it a harder to pronounce? Try both the American and British pronunciations. "You're a Nimmah, innit?"
Wouldn't a name like "Nimsta", or "Nimster" be better?
ChatGPT gave a few suggestions:
Nimble Ninja NimWizard Nimblefingers Code Nimrod Niminator Nimmaestro NimJedi NimChampion NimCraftsman NimWhiz
In this day and age it's only virtuous to stand up and fight the (mis)appropriation of a noble name Nimrod by a certain culture and use it proudly.
Some other ideas:
• Nim ⋈ Wizard → Nimzard • Nim ⋈ Engineer → Nimgineer