* Paisley doesn't have a direct Gaelic equivalent. Place names often don't translate directly; they reflect the historical evolution of the language and settlement. Paisley's name has origins in the Brittonic language, preceding Gaelic.
* Two main Gaelic languages exist. You'd need to specify whether you want the translation in Scottish Gaelic (Gàidhlig) or Irish Gaelic (Gaeilge). These are distinct languages.
To get a suitable greeting, you would say something like:
* Scottish Gaelic: You could use a general welcome phrase like "Fàilte gu..." (Welcome to...) and then add "Paisley," which will be understood even though it's not a Gaelic word. So, it would be "Fàilte gu Paisley."
* Irish Gaelic: Similarly, you would use "Fáilte go..." (Welcome to...) followed by "Paisley". This would be "Fáilte go Paisley."
While neither perfectly translates the name of the town, they convey the intended welcome in the respective Gaelic languages.