Faisal or Faysal comes from the Arabic word Fa'Sa'La. Which means broke apart, or separated in it's root form. Faisal, is a noun meaning the person who breaks apart or separates matters in a decisive fashion. The Arabs used to use the word Faisal as a name for the sword (because it is used to separate right from wrong, or good from evil). In the same respect it may also mean the judge whom separates good from evil.
― Anonymous User 5/16/2010
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The name originally means that which divides, most commonly referring to that which devides between right and wrong, thus, it has been become another word for sword. Also, "arbiter" is a better description for it than "judge". [noted -ed]