Rabbits learn their names very quickly, so just keep calling them and sound happy when you do so.
You can formally teach them to come by clicker training, but that’s a more specific process. I am having luck with it with Samantha, but she’s been with me a year now so we are already bonded. It’s going well though, and my problem of getting her to leave my bedroom if I let her in, by using the clicker and treats method when I say Come Here, is working so far.
Recognize when your bunny wants head pets. Many love to have their face, head and behind their ears rubbed by your hands, but you are better off letting them ask you for it. A bunny will come over to you (on the floor usually) and lower their head down with their back end up higher. It is how they ask other bunnies to groom them, so that’s what they want you to do, too.
Be sure to read The Language of Lagamorphs (uh. spelling. Anyone have their link?) for a good overview of what bunny behavior means.