I usually go with a name that fits the game theme and easy to remember, so I try not to use super complicated words...I'll explain what each game's name means but there's spoilers so don't read beyond this if you haven't finish them.
Silver Thread : It refers to a verse in the bible where there's a silver link between the soul and the body + Red thread of fate
Symbiosis : Hinting there's two types of living things in Magnolia's house
Post Memory : I had this idea where the Y looks interchangeable with a T in the logo so it can be rearranged as Post Mortem but alas I didn't have the time to finish this.