We have a family tradition for naming new born children that has been followed by parents of every generation till now. Infact my children were also named in the same way.

Parents and grand parents jointly suggest seven suitable choices. During the 21st day ceremony, these seven names are written on seven separate spots and seven earthen oil-lamps are kept over these spots, one over each. The lamp that lasts longest indicates the name of the child. This is just a custom and defies all logic..still it's fun to attend this ceremony in our extended family.