Lotfy,
It is not as simple. Google Sica Images and look at old excavated examples. They are "dog-leg", unlike gently curving khanjars. The unusual form of shibriya is deliberate and without an analogue anywhere else, except for Sica:-)
Please recall Judean "sicarii" around the time of Roman destruction of Second Temple. History has quite a lot of unusual twists and we might be wise to keep snippets of strange occurencies in the back of our collective mind. Of course, the connection between the two is nebulous and has no proof. But who knows? Sooner or later we might find actual facts confirming or refuting this hypothesis.
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