It looks like we are from the same family the spelling change of Mullinix is very common my grandmother spelled her last name Mulanix and her father spelled it Mulnix.Here is some records on Jonathan Sr. note his spelling. I have a lot of information on the Mullinix family if your interest we can compare information you can e-mail me direct at firstname.lastname@example.org,
Immigrant: Jack & Marion Kamikow and Jonathan Mulleneaux sailed from Newgate for Maryland on June 10, 1726 on Loyal Margrett, Captain Jon Wheaton.There were 69 passengers listed per PRO T53/32 pgs. 386-387.
Oath of Fidelity, Anne Arundel, Md. 5 Feb. 1777.Jonathan Mulleneaux Sr. & sons Henry, Thomas and William, (Wm. fought in Rev. War & was a POW).
News clip: Robert Barnes, "Marriages & Deaths from the Md. Gazette 1727-1839".Joseph Cranwell. (12 Mar. 1752).
Land Records: Jonathan Sr. rented 100 acres in An. Arn. Co. from Samuel Mansell for 21 years on 2 Oct. 1765. Rent was 600 lbs. of Tobacco a year.
News clip: Keren Mauer Green "Abstract from the Md. Gazette, 1727-1761" and Galveston, The Frontier Press, 1990. lofc. No. 89-082073, ISBN No. 0-032231-07-01, p.95 Wednesday, 27 Nov. 1751, No. 344.Jonathan Mullinix living at Elkridge reports a runaway manservant, Joseph Cranwell and a stray horse. P.156, Thursday, 14 Aug. 1755, Jonathan Mullinix at Elkridge reports a stray horse.P. 161, (same day) Jonathan Mullinix, living on Mr. Carrolls Manor, reports a runaway servant, John Broof, imported on the Rose by Capt. Slade, delivered to H.Bateman at Elkridge Landing. P. 162, Thursday, Aug 21 1755, No. 537. John Raitt, Sheriff has in custody a John Bruff who belongs to Jonathan Mulleneaux of Elk Ridge. P. 177, Thursday, 10 June 1756 No. 579: Jonathan Mulleneaux has been confined to Anne Arundel Co. jail for a long time, for Dept and petition Assembly for relief.