The problem is not excel but matlab, which currently only allows valid matlab variable names as table variables. For the moment, the only workaround is to convert your table to a cell array and append the header with whatever you want as the first row of the cell array. Assuming, R209a, you can then use writecell. In earlier versions, xlswrite.
c = table2cell(yourtable);
writecell([{'Information', 'EER', 'σ', 'morenames'}; c], 'C:\somewhere\somefile.xlsx')
