It shows up a lot in sea chanteys, too. I think it’s a case where various definitions fall upon the same word.
A lot of Irish people were forced to “rove” when they were evicted during the Ulster Plantation, for example, so one could make the case of a sad and serious history of that word. But, during the Highland clearances, a lot of Scots had to as well, so it likely comes in that way. So, thanks to the Brits, a lot of people have had to rove in the Isles because they were made homeless.
Then there’s the Traveller reference, because that’s what they do. But it’s also playful, in the case of sea songs, where they are ashore and going from bar to bar. And it also refers to going to sea as well, to see the world as it were.