You could just call him “Sh” and maybe that would encourage some, you know, quietness?
Famous people named Shawn:
Rapper Shawn Carter (a.k.a. Jay-Z); pro wrestlers Shawn Hernandez and Shawn Michaels; actor and comedian Shawn Wayans; singer Shawn Mendes.
The name Shawn may also be derived from the German word “schön,” meaning “beautiful.”