Due to the way language changes and evolves over time, some names that were once perfectly normal are now pretty silly. Like a man with the name Dick, we can't help but fight back a smirk when we hear it.
In the bird world, that hilarity is most common with the old habit of calling small, chattery birds "tits." (Go on, giggle. I'll wait.)
I'll admit to having some fun with that naming convention right here in my animal feature articles, but I promise that this particular fit of giggles is unrelated to the poor titmice.