When Sara Leisten's son was born two years ago, he emerged with one fist above his head, in a classic Superman flying pose. Naturally, his parents wanted to name him the Swedish equivalent of Superman, Staalman.

But the Swedish authorities, who have the power to approve or disapprove the names parents select, said no. Although Sara appealed, saying that the names "Tarzan" and "Batman" were allowed elsewhere in Sweden, she was refused and now calls her son David.

All is not lost, Superman. Swedish MPs are calling to change the legislation, as it is inconsistent and difficult to understand. Local tax authorities make the decisions, so parents in different towns essentially live under different rules.