Generally, Castlevania games are hard. Your Belmont is just about the most unwieldy thing on the planet. He's about as nimble as a cinder block. The enemies, on the other hand, are extremely agile, powerful, and sitting in really unfair positions. And what all that means in games like Castlevania 3 is that you're going to see this a lot.
Kind of disheartening to see, really. Especially since some of the later levels are absolutely brutal and will suck up all your lives even before you get to the boss of the stage.
So, you do what anyone would do in that position, you call out for help.
Which never works, but it makes you feel better, right? Except... What's this?
Yep, you now have ten Belmonts in reserve instead of the paltry 2 that you normally get.
Awesome.
Just remember to put the name back in when you go to enter in the passwords that you're given to continue your progress.