Partner; Pardner; Podner; Pard

“Partner” (as in “Howdy, Pardner!”) is often written as spoken, as “pardner” or “podner” or “pard.” These spellings are found in print from at least the 1830s.
 
 
(Dictionary of American Regional English)
partner n
Forms. Pronc-spp paa’dnuh, pard(e)ner, podna, podner; abbr pard scattered, but chiefly Sth, S Midl, SW
1795 Dearborn Columbian Grammar 137, List of Improprieties...Pardener for Partner. 1837 Sherwood Gaz. GA 71, Pardner, for partner. 1843 in 1940 Chabot TX Letters 46, I am chained now to Milvern Harold who makes a first rate pard.
 
1 June 1835, American Magazine of Useful and Entertaining Knowledge, “Collection of Vulgarisms; or Yankeeisms,” pg. 416:
Pardner for partner.