It is, they are kind of generic terms. Kali, Arnis, and Escrima are all terms used to denote Filipino stickfighting. The name of the system implies the lineage and founder e.g. Modern Arnis is the Arnis learned by those in the late GM Remy Presas' lineage. Dekiti Tirsia Siradas Kali is the Kali of GM Nene Tortal's lineage, which is what I train in. Lots of sticks, knives, broken Surfires...
Silat is harder to describe. As a CMA guy, I think you'd appreciate its fluidity and softness. It is also also a bladed art but, unlike Kali, the students learn the empty hand techs first before using weapons.