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With inspiration from other libraries

There is a newer version: 5.17.0

package io.nosqlbench.virtdata.library.realer;

import io.nosqlbench.virtdata.api.annotations.Categories;
import io.nosqlbench.virtdata.api.annotations.Category;
import io.nosqlbench.virtdata.api.annotations.Example;
import io.nosqlbench.virtdata.api.annotations.ThreadSafeMapper;
import io.nosqlbench.virtdata.library.basics.shared.distributions.WeightedStringsFromCSV;

import java.util.function.LongFunction;

/**
 * Return a pseudo-randomly sampled last name from the last US census data on last names
 * occurring more than 100 times.
 */
@ThreadSafeMapper
@Categories({Category.premade})
public class LastNames extends WeightedStringsFromCSV implements LongFunction {

    @Example({"LastNames()","select a random last name based on the chance of seeing it in the census data"})
    public LastNames() {
        super("Name", "prop100k", "data/surnames");
    }
    @Example({"LastNames('map')","select over the last names by probability as input varies from 1L to Long.MAX_VALUE"})
    public LastNames(String modifier) {
        super("Name", modifier, "prop100k", "data/surnames");
    }

}