How did Luxembourg get its name from the castle called Lucilinburhuc?

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The name Luxembourg is derived from the castle known as Lucilinburhuc, which translates to "Little Fortress".12

In 963 CE, Siegfried, count of Ardennes, acquired this strategically located site along the Alzette River by exchanging his own lands for it. This castle served as the cradle of the territory, and as the region developed into an independent entity, the name of the fortress evolved into the modern name, Luxembourg.123