I don't like
Elsa with an H on the end. It looks very clumsy, and very unnecessary.
Ferrex sounds rather... organic. Like a household cleaner or something that is good for iron stairs. Oh, hahaha. Yeah, I wrote that before I even read your sentence about it. Yes, like a cleaner.
I don't care for Fitch or Finch. Finch reminds me of the guy on that sitcom... what was it called. It had
David Spade in it and was about a magazine publishing company.
David Spade played a guy named Finch. I think it was his last name.