Considering that you are naming a new company some of these points are not valid/applicable. Being memorable is not easy unless people can repeatedly bump on to you which requires that your keep it in the news/advertising or that people can find you through mental or google searches. If you choose an abstract name people are not likely to find you again through search. I believe it's important for the name or part of the name to contain something descriptive. Names like "apple" "stripe" "zynga" are completely random; it would be a bad idea to name your bookmarking app after a tree or a liquor. Now, 'paypal', that's a great name. In the end however, a name is just a name, and doesn't really matter that much.