If the number of C matrices is known, then yes you can write a for loop to do this. At each iteration of the loop, a command string can be built and then evaluated:
N = 4;
cellArray = cell(N,1); % pre-allocate memory for the array
for i=1:N
% build the command string
cmd = ['cellArray{i} = C' num2str(i) ';'];
% evaluate the string
eval(cmd);
end
You could step through the code and see what cmd looks like at each iteration. Note that some developers have some concerns about using the eval command. Since you are building the command to be run at each iteration, it can make debugging (if an error should arise) somewhat more difficult.