A child should receive his name on the tenth, eleventh, twelfth, twenty-first (this is most favorable), hundred and first day, or exactly one year after birth, or on an auspicious day like Purnima. A good combination of sounds, when forming a name in harmony with the person receiving it (according to his time of birth), has a most important effect. The sound vibration which will follow and identify a person for the greater part of his life will have a significant effect on the person.