Trying to ID this gourd?
Did you plant this from saved seed or was it perhaps a volunteer in your garden this year?
It is possible that it is a cross-pollination between two squash or gourds which were growing in your garden last year.
Here is a page from our website about that: http://extension.umd.edu/hgic/fruits-not-true-type-vegetables
Otherwise, we wonder if it might be similar to a white crookneck pumpkin winter squash shown here: http://www.southernexposure.com/illinois-white-crookneck-pumpkin-winter-squash-4-g-p-1841.html