Composed in 1866, the song itself is in the public domain; however certain editions, performances, and recordings may have their own protection.
The original poem and musical setting are in the public domain, but certain arrangements and performances are still protected.
Nobody owns the copyright of a single word. Perhaps you mean trademark.
the coca cola company owns the copyright
A minor owns the copyright on any works they create.
Universal.
Rankin/Bass.
Rondor Music.
Word Music.
Paramount.
There are 24 different copyright-protected items by that name.
The phrase "copyright obtained" doesn't give any indication of who copyright might be assigned to.
You can't. It is a right that the writer owns. You can offer to buy the copyright.