If you google "Johann Henrick Pfleck" and "Davy" and "1738" you will find several websites where the information is posted. Here is one: http://www.progenealogists.com/palproject/pa/1738davy.htm
There are no other Pflecks listed on the passenger list with him, and it is not clear whether he is traveling with anyone else or alone. There are 140 other passengers listed, so I won't include all their names here.
I am curious if this Johann Henrick Pfleck is related to the Conrad Fleck who arrived about two weeks later to Philadelphia on 9 November 1738 on the ship Charming Nancy? Conrad Fleck also appears to have arrived alone. The passenger list for this ship can also be found on the Progenealogist website.