Adam Frederick STARK, born in Port-au-Prince ca. 1850, had a sister called Marie Elisabeth Zula STARK, born in Port-au-Prince ca. 1847, who became in 1867 the wife of Henry Auguste BROUARD. They were indeed the children of Frederich François STARK (born in Tripsees, Pommern, Germany ca. 1813) and Marie Elizabeth Félixine FÉLIX (born in Port-au-Prince ca. 1827).
Here is teh STARK / FÉLIX genealogy I have established:
1- Marie Elisabeth STARK, aka Zula (o P-au-P ca. 1847) Adam Frederick STARK (o P-au-P ca. 1850)
2- Frederich François STARK (o Tripsees, Pommern, Germany ca. 1813 + Lassère plantation, Croix-des-Bouquets, Haiti 06/06/1866) merchant. x P-au-P 23/10/1852 3- Marie Elizabeth FÉLIX, aka Félixine (o P-au-P ca. 1827 + P-au-P 14/05/1867) 4- Charles or Carl STARK 5- Sophie MEVS 6- Félix LUNEAU (died in the USA before 1865) 7- Geneviève RIGOGNE (o Croix-des-Bouquets 18/10/1794 + P- au-P 22/08/1868) 14- Pierre RIGOGNE (o France+ P-au-P 1804) 15- Marie Rose HECTOR, aka Risette (o Croix-des-Bouquets 03/05/1763 + P-au-P 26/06/1840)merchant. 30- Louis HECTOR (o Africa, of the Foiseda nation)candy maker. x Croix-des-Bouquets 07/05/1775 31- Marie Agnes (o Africa, of the Arada nation)
As for the STARK and MEVS genealogy, to go further up, you need to turn your search to Germany.You could verefy if the Mormon Church has on microfilm the records for the town of Tripsees in Pommern.