When I am in the middle of a meeting and the discussed name is not clear if it is male or female I usually hear the question "is it a he or a she?", is that a correct way to ask for the sex of a person?
Using 'it' to refer to a person sounds rude or insulting to many people. A better way of phrasing the question would be: "Are they male or female?" This is acceptable since the plural is now commonly used to refer to a single person of unknown gender as in "A flight attendant will deliver your meal to your seat". In fact "they" is also sometimes used as the personal pronoun for a person of non-binary identity.
Another alternative is to use the forename and say "Is Jamie Male or female?" It's better than using the surname since you would need to know the gender in order to say "Mr or "Ms".
It's not very elegant, but it is understandable in spoken English. "Man or woman" is probably a simpler way of asking.
Next we have Jamie Morita
Jamie ... Is that a man or woman?
You need to think about why you are asking this question. For example, if you were discussing job applicants for short-listing then the question would be inappropriate.