Say my name isn't really that deep of a song but its a really clever one in terms of how it plays with her vtuber persona. I would argue this is more of a seduction song than a love song due to the fact its clear the Nerissa we see cares more about captivating her audience rather than showing actual care or any romance. This is pretty much supported by the title of the song, which is itself in reference to her being a demon. In folklore and fairytales they are heavily tied with names and usually they gain power through how its used by mortals. Nerissa is basically trying to say be captivated and show me to those around you and I gain power through your infatuation of me.