South Languages and Tamil.

Its amazing how our languages are connected with each other, my theory.

தமிழ் + மெல்லினம் = மலையாளம் 

தமிழ் +  இடையினம் = கன்னட 

தமிழ் + வல்லினம் = தெலுகு 

For people who doesn't know to read Tamil, by the by you should know Tamil to understand this.

Tamil + Mellinam = malayalam

Tamil + Edaienam = Kannada

Tamil + Vallinam = Telugu
Browse through wiki on Tamil alphabets