Even though Sheldon clung to his friendship with Tam during his childhood, likely because it was his only real one, he grew up to eventually surround himself with a solid group of guys who fans came to know and love on The Big Bang Theory. One of them was Leonard, who is his closest friend until the series ended.
And in adult Sheldon’s voice-over during the younger Sheldon’s graduation, he said, “It was the best graduation party I had ever been to, until the one we had for my son, Leonard Cooper. I wanted his name to be Leonard Nimoy Cooper, but Amy wouldn’t let me.”
The fact that Sheldon named his son after Leonard was just too much for literally everyone.
Watch Young Sheldon on Thursdays at 8 p.m. ET on CBS.
Source : https://www.distractify.com/p/who-plays-tam-on-young-sheldon