The term "boy sperm" is not a scientifically accurate or commonly used phrase. Sperm carrying the Y chromosome, which determines male sex, are still called spermatozoa, spermatozoon, or sperm, just like sperm carrying the X chromosome (which determines female sex). There is no special or different name for sperm that carry the Y chromosome.
In more detail:
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Spermatozoa: This is the plural form of spermatozoon and is the general term for mature male reproductive cells.
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Spermatozoon: This is the singular form of spermatozoa and also refers to a mature male reproductive cell.
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Sperm: This is the most common and widely understood term for male reproductive cells.
The sex of a child is determined by whether the egg is fertilized by a sperm carrying an X chromosome (resulting in a female, XX) or a sperm carrying a Y chromosome (resulting in a male, XY). Both types of sperm are still referred to by the same terms. There is no specific, distinct term for the sperm carrying the Y chromosome (the "boy sperm").
