BS”D
There is and to the best of my knowledge has not been any brand of bleach sold under the brand name “ekonomika” alone for at least the past 25 years.
However, Sano (which I use for kiddush because it has a BaDaTz hechsher and has a nice lemon flavor), the off brands, and IIRC Cif all call their liquid chlorine bleach ekonomika, and non chlorine bleaches are marked “lelo ekonomika”.
If “ekonomika” were a brand name, that would be the equivalent of Pathmark’s bleach being called “Pathmark Clorox” which we know is not the case. Perhaps it was a brand name of bleach before 1948 that has since lost its copyright status.