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I'm curious about the broken blue and red lines. Why is data available for the girl's names if they have as few as 31 instances, but not available for the boy's names if they have fewer than 40? Is this graph based on a limited list of "most popular" names (for instance, the top 500 or 1000)?

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It's impossible to tell from this data if there are currently more girls than boys being named Blake, or vice versa, or if they are roughly equal.