My initial gamertag was Stundorn what is my GT for many, many years back in the 90ies. Another Story :-)
I changed it to Bugaboo Bill because i like the carribean flair as i'm a percussionist in a Reggae Band.
Bugayaga means common, unworthy or even a sloppy, dirty person like a beggar in jamaican patois afaik.
I cant find the reference anymore, but Bugaboo is a kind of variation of it and there is a small tale or poem about a giant who hassle the people of a village once and again who is called Bugaboo Bill.
Here's the thread were i tried to adapt this original poem and explained more about it in Detail who Bugaboo Bill is :-)
https://www.seaofthieves.com/forum/topic/76678/help-me-do-a-poem