First up, "iphone" is definitely not descriptive, it's abstract, a made up word. "touchPhone" would be descriptive. "Windows", well ... it's a generic term now but at the time, despite it being to some extent descriptive of a WIMP system it was arguably a distinctive term for an OS (but I'm surprised it was allowed).

OpenOffice.org is interesting because they previously named the project "Open Office" and suffered trademark problems and had to be very careful to use the full name of the project. But had the former project been called "Computer Office Suite" then trademark issues wouldn't have arisen because that's not a distinctive mark and so couldn't be protected, it's descriptive anyone selling such software could use that description.

It's not unfair to use an identical descriptive name for things that serve the same function - for example Microsoft and Apple both sell something that they use the term "Operating System" to describe. OS is a descriptve term that is expected to be used in the field and so can't be a trademark, it doesn't serve to indicate origin.

I'd argue that visitor.js is an expected name for a piece javascript that logs visitors in some way, it's not distinctive of origin. Moreover it is descriptive of the function of the code. Kinda like having an ad loader that's called ads.js.

FWIW, and I've not been paying too much attention (!), only one of the pieces of code labelled visitor.js appears to be a product.