My colleague has the same name as my boss.
His nickname (translates to "Shorty") is based on his last name.
And that's so weird to say as someone being younger and smaller than your colleague to call him "Shorty".
Reason is my dad calls me "Großer" (literal translation: Bigger -> As in "The great") and I jokingly call him that back. But the same thing can be said with calling him "Kurzer" if he's smaller.