Probably related to Amalia or Ameline, from Germanic amal meaning work or industriousness.
Amalin is probably related to Amalia or Ameline, and those names ultimately connect to the Germanic root amal, meaning work or industriousness. That root gives the name a quiet sense of purpose beneath its softer, more refined surface.
In modern use, Amalin feels graceful and slightly old-world, with the kind of finish that suggests both dignity and delicacy. It has the airy, feminine shape of a classic name, but because it is so uncommon, it avoids sounding overfamiliar. The result is a name that feels polished, industrious in spirit, and gently aristocratic.