All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
There is nothing wrong in giving Zakat on these cash savings from other money, whether your salary or something else.
Since you write to us in Arabic sometimes, then we refer you to Fatwa 27006 in the Arabic section on the recipients of Zakat.
Also, for more benefit, you may refer to Fataawa 92458, 93584, and 159867 in our English Site.
Allah knows best.