It seems simplest in Tamil Nadu, where the girl’s name is prefixed with “Sow” (or “Sou”; for Sowbhagyavathi) while the boy’s name is prefixed with “Chi” (for Chiranjeevi). Considering most Tams have only one initial to their names, this sounds fair.
As we move to Andhra, the boy’s prefix remains “Chi” while the girl’s prefix gets elongated to “Chi Lax Sow”. I guess this is in line with the practice of three or more initials in Andhra.
In Karnataka, where two initials are dominant (at least were dominant in my parents’ generation; though not in mine (for eg. my father decided “Gollahalli” sounded too country to be part of my name so he dropped it and gave me only one initial) ) both boys and girls have two syllable prefixes. Girls get “Chi Sow” (for chiranjeevi sowbhagyavathi i guess). Boys get “Chi Ry” (I have no clue what Ry stands for. Maybe Karnataka boys show a special fondness for rye-based drinks).
Found this pertinent given that this afternoon I journeyed to Sultanpet and bought cards on which we’ll print our wedding invites.