It's interesting to note the maru-oo mozhi of 'ch' in Malayalam...
Chithra + chechchi = Chithra chEchchi (Here 'ch' is both written & pronounced)
Rama + chandran = Ramachandran, pronounced as RamEndran (Here 'ch' is written but swallowed while pronouncing)
Das + chEttan = DasEttan :-) 'ch' is neither written not pronounced :-)