Languages and regional accents are so interesting. I find it interesting in parts of Mexico and SA they do say it a bit more like Joe than Yo. In Welsh I think it's interesting that the word for thieves is the same as the Spanish word for one thief - ladron. The word for one thief is something totally different that I don't remember. So I'm guessing in early Wales, they had a word for one thief, and maybe put a number in front if it or something to pluralize it. Then, when the Romans came, they used the Latin word for thieves, and it stuck. Too much coincidence to be random, anyway.