Some captains from a list in 1652

I find that lists are interesting for the little bits of information that can be gleaned, such as middle names or variations on men's names. For example, from a list dated 4 November 1652:

Captain                          Adm   Ship
Hendrick Jansz de Munnick        R     Holland      30 guns
Leendert Haexwandt               R     Utrecht      22 guns
Dirck Juijnbol                   R     Schiedam     30 guns
Dirck Vijgh                      R     Overijssel   22 guns
Ernestus de Barterij             R     Hollandia    24 guns
Corstiaen Eldertszoon            R     Roscam       26 guns
Marinus de Clercq                R     Sphera Mundi 26 guns
Corstiaen Corstiaensz de Munnick R-Dir Prins        38 guns