Is it correct
His name is engraved in my heart.

Do we use this idiom only to talk about the past and memories and dead people?
Can I use it to talk about someone alive?

Thanks!

Question

Is it correct
His name is engraved in my heart.

Do we use this idiom only to talk about the past and memories and dead people?
Can I use it to talk about someone alive?

Thanks!

Answer

You can use it for either. I don't think it implies being alive or dead at all.
If he were dead you wold probably say:
His name WAS engraved in my heart.
Anyway, there is definitely no implication.

Answer

If I heard this phrase, I would assume one of two things:

1) The girl is lovesick and overly dramatic.

2) The person she is referring to has passed away.

If you love a person, just 'I love you' will have all the effect you want, without being overly dramatic.  It can be a very underestimated phrase.