About not being able to call your name

In the Jodo Shinshu sect, “Namu Amida Buddha” is the root of this.

This is to honor (say) the name of the Buddha called Amida Nyorai.

The importance of praising the name of the Buddha is written in various places in the sutras of the Jodo religion.

Every human being, even your boyfriend, is the Buddha of the future.
I think it can also be taken as praising the name of the future Buddha.

I read it. I see... you're quite worried.

Please talk to him from a monk.
“This is the future from your side. Why don't you think carefully about how you want to live in the future? Among them, what would you like to be called as you head into the future? That will also lead to your future. There's no need to rush, but please calm your mind and think carefully to find the answer.”

Incidentally, calling someone by name... clearly recognizes that person, confronts them head-on, and calls out with all their heart leads to sincerely wishing for them.

I sincerely pray to Shinto and Buddha that the future between you and him will grow well while respecting each other and helping each other

I think you're worried about a very good point. Calling a name, or naming it, is actually a religious matter.
In other words, it shows the relationship with the other party. I am also a boy from the Pure Land system, but Amida is not in a relationship where “Amida” can be called out. It's just an “Amida-san,” even when you're maximally drunk. There is no such thing as a “proper fit.”
So, as an entrance, why don't you say “sanzuki” the other person? If you're being rushed, it probably means that your partner also wants an expression of closeness. Hold it slowly, and ask the other person to hold it up too, saying, “I want to start with a star, but I wonder if they can listen to it.” When I'm ready, I'll say “with three.” I'm sure your partner will respond “yes” or “yes.” And then I'll call again. This repetition is important. “Can I call you again?” It's about asking.
There are often scenes like this in shoujo manga, don't you think? The name is a symbol that enters into a different relationship than before. So it's natural to be nervous. Please call while being nervous. As you repeat it, you'll definitely feel refreshed.
Calling someone's name is definitely an expression of “I can't live alone.” So I understand very well that it can't be done easily. And since I care about him, I get nervous for some reason. It's quite natural. So if it's awkward at first, I think it would rather convey your level of seriousness. That's great.

By calling that name, something about yourself will probably change.
Humans are afraid of pride, and they want to think of themselves as wonderful beings.
In other words, I want to think that you are wonderful right now.
If you call someone by a name you haven't called until now, you will be denying yourself up until now and changing to your new self.
You might also feel something scary, embarrassed, or something like that.

However, humans change. Also, it will change.
For example, if a junior high school student clings to their middle school self and doesn't change forever, saying “I'm not going to be like those adults,” they won't be able to grow forever.
When the chicks of flightless birds throw themselves out of their nest into the air for the first time, it's not a hopeless change.
Don't be afraid of change.
Let's fight against the worries of our own pride once in a while.

　Hello.

I remember that in the shopping district where I used to live, the shopkeeper's old man called his wife “hey, hey,” and they seemed smiled even though they were a very old couple.

This is a story about when I was a college student and went to play at my classmate's parents' house. When my father came home from work, my mother called my husband by a nickname, which also made me feel somewhat smiled and envious.

My wife calls me by my name. When we were in a relationship, we were called by nicknames, and I wanted them to keep calling them by their nickname, but my wife changed the way we called them without permission (laughs). Actually, I still don't feel comfortable being called by name.

As an aside, once we get married and have children, we start calling each other “dad and mom.” When the second one is born, the first one is called “Onii-chan.” In this way, calling it according to the youngest person seems to be a culture unique to Japan.

The way they are called naturally changes like this, so I also feel like there is no need to overdo it in particular.

But I'd like to change the way they're called. Changing the way we call it is embarrassing, isn't it?
Speaking of which, I used to do workshops at temples where people who aren't good at relationships gather. Among them, there was a person who was worried, “I can't say good morning to my grandpa in the morning at home.”
As a solution, all participants performed a play that recreated the situation in the morning. Did you say “drama therapy” or something? The person himself does his job. Then, participants are asked to play the role of grandpa or mother, and they practice making them say “good morning.”
Why don't you ask your friend (a woman is fine) to play the role of your boyfriend, do a play where you absolutely have to call your name, and practice calling them by name?