Mariko

Mariko is now considered a pretty old-fashioned name in Japan... names with the "ko" character have been falling out of fashion for a while. They are equivalent to names like Jane or Susan in English - not "old lady" per se, but "traditional" names that are more common in older women. More popular now would be names like Mari, Marina, Marika however "Marika" sounds like a Spanish swear word and should probably be avoided unless you can guarantee that the child will never meet a Spanish speaker or go to a country where Spanish is spoken...