Each of the hobbits actually have a second name, not in Westron, but in their own language (which there is little record of) I will name some of them below and extra words.
Bilbo Baggins - Bilba Labingi
Frodo Baggins - Maura Labingi (His actual last name would be Brandybuck/Brambagamba I think if not for Bilbo's adoption)*
Samwise Gamgee - Banazir Galbasi (also spelt Galpsi) Nickname Ban
Meriadoc Brandybuck - Kalimac Brambagamba Nickname Kali
Peregrin Took - Razanur Tuk Unknown Nickname
*"You'll live to regret it, young fellow! Why didn't you go too? You don't
belong here; you're no Baggins - you - you're a Brandybuck!"
"Did you hear that, Merry? That was an insult, if you like," said Frodo as he
shut the door on her.
"It was a compliment," said Merry Brandybuck, 'and so, of course, not true."
Hobbit - Kuduk
Holbytlan - Kud-dukan
Smial - Tran
Mathom - Kast
Thain - title of the ruler of the Shire
Withywindle - A Hobbitish name for the river
Swertings - Swarthy Men
Oliphaunts - Mumakil
Goblin - Orc
Days and Months
For Sterrendei, Sunnendei, and Monnendei, pronouncations stay the same.
Sterrendei is Saturday, then go in order.