What does it mean when a guy jokingly says “you will have my last name, and be the mother of my kids” he keeps saying that he wants kids with me?

Is this something that he would actually say as a joke or has he been thinking about this for real?

What does it mean when a guy jokingly says “you will have my last name, and be the mother of my kids” he keeps saying that he wants kids with me?
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