So hard to answer because it seems there are so many variants but in my Cat-Su-Dal variation it would be the "Su" part that has the emphasis. Very good point!! Can the others in the group also show where the emphasis, the accent, in their version of the pronunciation of Catudal is made.
You know how when you go someplace and they ask you your name and you say "Catudal", has it ever happened that you didn't have to spell it?
Just as an aside, I live in Germany and my last name of Schneider is as common as Smith would be in the States, so I never have to spell it. What I do have to spell is Judy. They have no idea where to begin with my first name. The letter "J" in the German language sounds like the letter "Y" as pronounce in the word "you". The letter "Y" has a totally different sound as well.