A New Zealand couple apparently named their son "Superman". 4Real. Actually, 4Real was their 1st choice, but the government registry rejected the name because it contained a digit. Elsewhere, a Chinese couple clashed with their government when they tried to give their baby this moniker "@".

Funnily enough, some celebrities have already followed suit. Ex:

Audio Science (son of actress Shannyn Sonnamon)
Bluebell Madonna (daughter of Spice Girl Geri Halliwell)
Daisy Boo (daughter of chef Jamie Oliver)
Pilot Inspektor (son of actor Jason Lee)
Heavenly Hirani Tiger Lily (daughter of TV host Paula Yates)
God'Iss Love Stone (Daughter of singer Lil' Mo)
Jermajesty (son of singer Jermain Jackson)

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this is in this monts issue of Reader's digest... dunno the authenticity ('cept the Chinese couple story). But lolz nonetheless!