Siren is actually the term roman languages use to translate mermaid, intended as the female gender of this fantasy race.
Quite funny, because in Greek mythology Sirens were, like mermaids, marine creatures known for enchanting seamen with their songs, but they were feathered.
Like harpies, but they were hot, while harpies openly described as ugly crones.

Final Fantasy VIII nailed it.
A funny hypothesis on how the sirens became the Mediterranean homologous of mermaids comes from the fact that the Latin word penna translates both in fin and feather, and some mistranslations could have caused the sirens to transforms from feathered to finned creatures.
A more realistic hypothesis is that during the Middle ages they tried to retcon away any humanoid creature with wings that wasn't an angel.
In the memories of Christopher Columbus is registered an encounter with a group of sirens, the finned kind, and it commented something like that:
«They're not as feminine and graceful as I expected.»
In all likelihood, his crew met a pack of dugongs.
Indeed dugongs, like walruses make part of the order of the Sirenia.
And here ends my long explanation for giving to this daddy walrus this name. Siren. These guys developed a tail like cetaceans and use their lower limbs to stand up while on the ground.
Like my other mammal mermen they cannot retract their genitals, so to avoid scratching them on rocks they developed a belt and band system to protect them.
They love singing, although they're several octaves below your little mermaid timbre. But their songs have an equally powerful arousing effect on lonely seamen. In this age, they would make great ASMR tracks.
The update of SkyHorn's Adventures will arrive tomorrow. Be patient!