They're basically a shortcut to establishing a consistent, instinctive sense of culture and history without infodumping. If every character gets a name from a tool like that, suddenly you have a pattern. Maybe a lot of '-fang' or '-moon' suffixes, or names that borrow from Norse or Old English roots to imply ancient lineage. It sets the tone immediately. A werewolf named 'Kaelen Shadow-Maw' suggests a different social structure and aesthetic than one named 'Rusty'. The generator forces you to think about the naming logic itself, which is a worldbuilding cornerstone. I used one for a tabletop game, and just the act of generating a list made me decide my pack's names were derived from geographical features within their territory—'River-Stone', 'High-Pine', 'Broken-Cliff'. That ended up informing their whole territorial religion. It's subtle, but those names do a ton of heavy lifting in making the supernatural society feel lived-in and separate from the human one.
Plus, it helps avoid the cringe factor. Manually trying to come up with 'cool' werewolf names can lead to some real clunkers if you're not careful. A decent generator provides a soundboard, a pool of options that fit a thematic palette. You can mix and match, see what feels right for an alpha versus a lone wolf. The right name carries weight, implying status, parentage, or even a past deed. It's a small detail that readers and players latch onto, making the world feel more tangible and less like a collection of stats.