Oh, flipping no! It doesn't mean "Sword". The Arabic word for sword is "سيف" read "Saif". Husam is one of the names given to swords for based on characteristics. It's derived from "Hasm" meaning to determine, settle, or decide something. Thus, in this case, a "Husam" sword would be one strong or sharp enough to deliver a decisive blow.
In general, this name linguistically means : Finisher, One who settles things, One who resolves things.Also, it can be used as a characteristic for a sword if it's sharp and can finish the enemy for example.