I attended UW before they built the “new library” (OUGL). Everyone I heard say Suzallo, said it with the accent on the first syllable. But since there was only one library at the time, most people just said “the library”.
I bet Mr. or Ms. Suzallo said his or her name with the accent on the second syllable, though.
Yep, I heard both somewhat frequently when I was there, but I’d also give the edge to placing the stress on the first syllable. I don’t think would be considered particularly wrong to say it the other way. At least, I never heard anybody correct someone who had put the stress on the second syllable.