Why does this guy keep saying my name this way?

There’s this guy I see at work everyday. We talk here and there but sometimes (a lot here recently) he sees me before I see him and he will call my name in a girly high pitch dramatic voice. Like my name is Lisa. He will go “Leeessaaaaa” all girly and jokingly like, Is he flirting or being funny? Yes i kinda like him but suck at reading guys behavior
Why does this guy keep saying my name this way?
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