Easiest would be to use arrays instead of a zillion sequentially named individual variables; associate a string array of names with them if desired (for the example, it could be simply an expression such as
nColumns=size(yourNewArrayReplacingVariables,2);
tT=array2table(yourNewArrayReplacingVariables,'VariableNames',cellstr(char('a'+[0:N-1].')));
writetable('yourExcelFile.xlsx',tT,'WriteVariableNames',1)
