What the scriptures say about timing
Namkaran (nāmakaraṇa) is the fifth of the traditional sixteen sanskaras. The Manusmriti (2.30) says the naming should be done on the tenth or twelfth day after birth, on an auspicious tithi, muhurat and nakshatra. The Grihya Sutras give similar windows. The reason for the tenth day is practical as well as ritual: the sutak — the period of birth-related impurity in the household — ends around then, and the mother and baby have come through the most fragile days.
In practice, many families now hold it on the 11th, 12th, a later convenient day, or even at the first birthday. Tradition allows this: if the tenth or twelfth day is missed, a later day with a good panchang is chosen.
How the first letter is chosen
Each of the 27 nakshatras is divided into four charanas (quarters), and each quarter is assigned a syllable. The baby's Moon at the moment of birth falls in one of these 108 quarters, and that syllable is recommended as the first sound of the name. For example, the four quarters of Ashwini give chu, che, cho, la; those of Rohini give o, va, vi, vu. The table that lists all of them is called the Avakahada Chakra, and every panchang or kundli printout includes it.
Many families give two names: a nakshatra name used in rituals, horoscopes and sankalpa, and a vyavaharik (everyday) name the child actually goes by. This is completely traditional — it is how a child can have a ritual name beginning with "Chu" and be called Aarav at school.
Choosing the day
- Tithi: avoid the rikta tithis (Chaturthi, Navami, Chaturdashi) and Amavasya.
- Nakshatra: the "soft" (mridu), "fixed" (dhruva), "swift" (kshipra) and "movable" (chara) groups are preferred — for example Rohini, Mrigashira, Punarvasu, Pushya, Hasta, Chitra, Anuradha, Shravana and Revati. The fierce (ugra) and sharp (tikshna) groups such as Bharani, Ardra and Mula are avoided.
- Day: Monday, Wednesday, Thursday and Friday are generally preferred.
- Avoid: Bhadra, Rahu Kaal, and an eclipse day.
How the ceremony is done
- The house is cleaned and the mother and baby bathe; the mother wears new or fresh clothes.
- A Ganesh puja and kalash sthapana begin the rite, followed by worship of the family deity and the nine planets.
- The father (or the priest) whispers the chosen name into the baby's right ear, and then says it aloud for the family to hear.
- The name is often written on a bronze plate filled with rice, with a gold or silver stick.
- Elders bless the child, and a small havan and meal follow.
What makes a good name, traditionally
The Grihya Sutras and Manusmriti give guidance that is surprisingly linguistic: names were to be pleasant to say, have an even number of syllables for boys in some traditions, and avoid harsh or frightening meanings. Most families today simply choose a name of a deity, a virtue or a natural beauty — Aditya, Shreya, Ganga — which fits the spirit of the rule.
A note on flexibility
If the nakshatra syllable gives no name you like, it is normal to use it only as the ritual name. And a child named on a less-than-ideal day has not been harmed; the sanskara is about formally welcoming the baby into the family and the community, which happens whatever the panchang says.