How to make a variable unaccessible to users but accessible to code in browser?

I have a list of names populated in a searchable table. When the user types certain characters, relevant names are shown (like Google search). I do not want to store the list on the server as it increases the computational cost significantly. Moreover, I do not want the users to be able to access all the names (only the filtered top 10 odd names). Is there any way to do this??