Bertie

Bertie is a character that appears in Skyward Sword. He infuses potions bought at his wife Luv's Potion Shop in exchange for Bugs and Ruppees.

Biography
Bertie works alongside his wife Luv in the Skyloft Bazaar. He cares for their young child as he works on infusing Potions his wife makes for customers.

Later on in the game, Bertie can be seen acting tired and restless at his job. Speaking to him at his house during the night will reveal that his child's Rattle had been taken by a bird a while ago, causing his child to be unable to sleep thus preventing him from sleeping as well. Link can locate this Rattle in Skyloft lying in a nest atop a house. Returning the Rattle to Bertie will reward Link with 5 Gratitude Crystals, ending Bertie's sleepless nights.

Etymology
Though Bertie itself is a proper name, all Skyloftian names are derived from birds. Bertie is most likely derived from the word "bird" itself.

Trivia

 * Of all of the Skyloftian featured in Skyward Sword, Bertie most resembles the art style of characters featured in Wind Waker.