That's not the right translation for "rust", not to mention proper names usually aren't translated at all.
Well done both of you.
Yep, ferro it's iron, any Romance speaker will know that (in Spanish it's 'hierro'), and the adjective of something related or made from iron it's 'férrico'.
What’s the word for the rust on the iron though?
“robigo”, genitive “robiginis”, feminine.
Ah, I guess that makes sense. “rust” comes from the PIE word for red via German, and “ruby” comes from the same PIE word for red via Latin. So it makes sense that the Latin word for “rust” would be similar to the Latin word for “red” :)