I know how to say per gessle because my stepmom loved this group, and I remember it being said on the radio when "Listen To Your Heart" was gigantic! I
Believe you spelled the last name incorrectly, but it is said like "pear" "guess" "ull" gessle rhymes with vessel
You can search "roxette interview" on YouTube. All I could find were swedish interviews, but they all seem to say it this way.