Well, I pronounce it the first way (so-LAH-ris), but then I’ve used this (scalable, Unix) operating system on Sun work stations. I think that’s also the way i’ve heard the book “Solaris” by Stanislaw Lem pronounced. On the other hand, I don’t know how the Tom Bihn folks choose to pronounce it. It was a bit of a surprise to see it suddenly go up as the official name a few hours after I threw it out in a list of possible names in a post in the Admin forums. (That was the first time I’d seen “Solaris” used in the context of a possible color name.)
moriond
ETA: i’ve Heard it pronounced both ways:
How to pronounce Solaris: howtopronounce.cc
I also found this:
https://forvo.com/word/solaris