Scotty
Scotty was a nickname both for Montgomery Scott and  in the alternate reality. 

In the alternate reality,  regularly used the nickname and even used it to introduce Scott to  in 2259. () In 2263 of the alternate reality, after Scott had met Jaylah on Altamid, she called him "Montgomery Scotty." ()

The nickname Scotty was used by various shipmates of Scott during his service aboard the  and the  from the 2260s to the 2290s, including James T. Kirk, Leonard McCoy, Nyota Uhura, Hikaru Sulu, Carolyn Palamas, Christine Chapel, Mira Romaine, Will Decker, and Pavel Chekov. It was even used in the official captain's log. (; ) 

Scott also occasionally used the nickname himself. (, , ; )

It was similarly used by his junior engineers in Scott's absence. ()

He was later called "Mister Scotty" by the Pandronian Honorary Commander Ari bn Bem in 2269. ()

In 2369, when Captain Jean-Luc Picard called Montgomery Scott "Captain Scott," Scott told Picard instead to call him Scotty. Scott later made the same remark to Geordi La Forge, reminding him that they were in Engineering at the time and formality was not needed. Only La Forge and William T. Riker ultimately called Scott by this nickname. ()

In 2380 on the USS Cerritos, Commander Jack Ransom was telling Captain Carol Freeman about people that lived during the TOS era, and one of them he mentioned was Scotty. ()

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Nicknames