I noticed this because of the Youtube videos about the to-be-released Pokemon game. There is a new battling style called "Battle Royal" and in those videos they pronounce royal as "roi-aww," putting the stress at the 2nd syllable.
Is this a non-English word or does it have other meanings? I went online but there is only info about the royal I familiar with. Thanks.
For your kind reference, you may want to check out the video at https://www.youtube.com/watch?v=OvSgH-48kXs at 5:03 on Youtube.