London

In 2018, 2 is the most common age for an American (U.S.) London who is registered male with the Social Security Administration. It is the 3, 111th most common male first name for living U.S. citizens.

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In 2018, 2 is the most common age for an American (U.S.) London who is registered female with the Social Security Administration. It is the 1, 941st most common female first name for living U.S. citizens.

The name London was given to 345 boys born in the US in 2016.

Jack London WAS in fact his pen name; his real name was John Griffith Chaney. This name has very minimal, if any, usage as a traditional last name, male name, or any name at all, although the SSA's website does show there being a select few males named it from about 1880 to 1960. It didn't enter the top 1000 for girls until 1999, which is a testament to how 'faddish' it is since it had hit the top 100 by 2011.

Actually, here in the USA names like Paris and London are rising in popularity. I've also seen the name America used more frequently. I don't see why London would be unpopular in England. I live on Long Island and I know several girls named Brooklyn (Brook Lynn is used by one girl whom I know).