Stars for Frodo and Sam
Jan-u-wine and 'Primmy'/Debbie (the "other Prim") had stars named after Frodo and Sam.
These are the official documents, though it is more of a vanity thing and it isn't recognized in official astronomer circles.
For those stars, the names were taken from the History of Middle Earth:
Bronwe athan Harthad is the name given to Frodo by Gandalf.
(vol.IX, Sauron Defeated: 'Many Partings') and means Endurance Beyond Hope.
Likewise, Samwise was given the name Harthad Uluithiad, or Hope Unquenchable.
"... I name before you all Frodo of the Shire and Samwise his servant.
And the bards and minstrels should give them new names:
Bronwe athan Harthad and Harthad Uluithiad,
Endurance beyond Hope, and Hope Unquenchable."