I have four banjolins or banjo mandolins or mandolin banjos. I have heard them called by all of those names. They were popular in war time "Banjo, mandolin, guitar bands" in the U.K. because in those days before good amplification the were as loud as a full size banjo, People used to take the strings off and fit them with gut strings tuned A D F# B and turn them into ukelelie banjos when George Formby was popular as the scale length is just about the same. In the U.K at the moment they are out of fashion and only bring about £30 to £50 but if you play mandolin and want something louder and twangier they are a sound investment and one day they might come back into fashion Cheers Bill