In terms of at-the-table confidence, there’s one tool that’s made the biggest difference for me: a notecard.
Just one regular notecard, clipped to my DM screen.
And on that notecard is a list of names, male on the left, female on the right.
And that’s it. It took me less than ten minutes to make, and I can easily say that having names ready at the drop of a hat gives a surprising confidence. I can describe things, mentioning a random dude or dudette, and if the players say, “What’s your name?” to a random NPC, voila! they have a name.
Give it a shot! You won’t regret it.
Now get out there and tell a story!