How do you say jimmy in Gaelic?

There isn't a direct translation of the name "Jimmy" in Gaelic (either Scottish Gaelic or Irish Gaelic) that retains the meaning or sound. "Jimmy" is a diminutive of "James," and you would translate *James* into Gaelic.

* Scottish Gaelic: Seumas (pronounced something like "SHOH-mus")

* Irish Gaelic: Séamus (pronounced similarly to the Scottish version)

Therefore, a diminutive of "Jimmy" in Gaelic might be a shortened, informal version of Seumas or Séamus, but there's no established, universally accepted equivalent. You could possibly use a diminutive form that exists within Gaelic itself, but it would be a different name altogether.