Can a child theme based on Starker theme be released as free to use theme for public use?

I created a child theme named “Naksh” based on the “Starker” theme. Now I want to showcase it on WordPress. So, can I release it under GPL? Also is there any money I need to pay to Starker’s creator for using his theme as a starting point?

Just looked in the _LINCESE.txt file inside the theme folder. The theme is using the GPLv2 license and is also free available to everyone. Therefore you should not get any problems here.