Why does my professor always address only me with my full name?

When he checks attendance he always calls everyone’s first name but when he checks mine he lately calls my first and last name for instance „Helen miller“ or something. Why? My first name is not very common in this country and I’m the only one with my name in his class. This also only happened since he asked me once how to pronounce my name. Is it a bad sign?

Why does my professor always address only me with my full name?
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