Possible birth year 1812 according to JewishGen.
Isaac and his family are mistakenly listed on the 1850 Federal Census as Heilmer. The records on Ancestry further mistake the name for Hirlmer. In 1850, Isaac is listed as a laborer living in Franklin Township, Montour County, Pennsylvania, who was born in Germany.
Isaac may have arrived in the USA on 27 September 1837 on the Brig Franklin. He is listed as being a butcher from Bavaria, port of departure Hamburg. This info is from Arriving Passenger and Immigration Lists, 1820-1850, Microfilm Serial Number M237, Microfilm Roll Number 35, List Number 836. On Ancestry, you can view his name on the immigration list if you search for “Isaac Hailner” and look toward the bottom of the page.