Bones
"Bones" was a nickname for Doctor Leonard McCoy in multiple realities.

In the prime reality, "Bones" was short for "Sawbones"; this long version was used by James T. Kirk only rarely, usually using the shortened version "Bones" during their service together. (; )

During a 2267 landing party mission on Pyris VII, Kirk made a special point to avoid calling McCoy "Bones", instead using the nickname "Doc", after finding themselves in shackles hanging alongside a skeleton. ()

After watching a recording by the presumed-dead Kirk in 2268, Spock used the nickname by telling McCoy "Forget it, Bones", although he called it something Kirk would have said. ()

In the alternate reality,  referred to  as Bones because, as mentioned by the doctor the first time they met, all his ex-wife left him after their divorce was his bones. ()

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Nicknames