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Catharine (Younkin) Lehmer


Catherine (Younkin) Lehmer (1803-1829) was born on April 16, 1803 in Turkeyfoot Township, Somerset County, PA, the daughter of Johannes "Frederick" and Catherine (Patton) Younkin

As a baby she received Christian baptism in the Sanner Church in Milford Township. 

She wed Henry Lehmer (1798-1870), son of Jacob and Catherine Lehmer.

The couple bore four children – Derrick Fernstück Lehmer., Maria "Catharine" Phillippi, Rebecca Lehmer and Mary Ann Lehmer. 

Catherine was taken in death at the untimely age of 25 in about 1829. Details seem to be lost to history.

Her husband survived her by more than four decades. Circa 1843, at the death of his father in law, Henry made his home in Ohio and was named as such in Somerset County estate administration documents. 

Henry has yet to be located on the federal censuses of 1850 and 1860.

He passed into eternity in 1870, at the age of 72. More than a century later, when researcher Otto Roosevelt Younkin was sifting through the tangled vines of the Younkin genealogy, he wrote their family name as "Lamar" but was able to gather no additional information of any kind about the family.


~ Son Derrick Fernstück Lehmer ~

Son Derrick Fernstück Lehmer (1822-1908) was born on May 30, 1822 in Turkeyfoot Township. If so, he wed Isabelle Smith Perry (1823?- ? ), a native of Bourbon County, KY. They were united in marriage on Aug. 8, 1848 when he was age 26 and she 25. 

By 1849, they had relocated to Indiana to pursue their fortunes. They settled in Waltz Township, Wabash County, IN, where Derrick established himself as a dry goods merchant in the community known as Twin Springs or Springfield. Later, the town name was changed to "Somerset." 

Their known children were Frances C. Lehmer, Oliver Cromwell Lehmer, Nancy J. Lehmer, Calista Isabel Lehmer, Josephine P. Lehmer, Henry Lehmer, William "Willie" Lehmer, Archie Lehmer, Derrick Lehmer Jr. and one other whose identity is unknown. 

When the federal censuses were enumerated in 1850 and 1860, the Lehmers made their home in Waltz. In 1860, in addition to their five children, five-year-old William H. Colden lived under their roof. In about 1867, after the birth of their ninth child, Derrick and Isabella made the decision to push further west. They migrated into Nebraska where they put down stakes in Lincoln, Lancaster County. In the 1870 census listing, Derrick gave his occupation as farmer, daughter Frances as "school teacher" and son Cromwell as "works on farm." Their home in 1880, as shown by the census, was Yankee Hill Precinct in Lancaster County. 

In 1900, they lived in the Douglas Precinct of Lancaster County. That year, Derrick was listed as a "retired merchant" while son Henry, single at age 39 and living at home, earned a living as a "stock feeder." 

Derrick is reputed to have died in 1908. Six years after his death, he was mentioned in Clark W. Weesner's book History of Wabash County, Indiana in a chapter about Waltz Township.

Daughter Frances C. Lehmer (1849-1920?) was born in 1849 in Somerset, Wabash County, IN. She is believed to have died on Oct. 8, 1920.

Son Oliver Cromwell Lehmer (1851- ? ) was born in 1851 in Wabash County, IN.

Daughter Nancy Jane Lehmer (1855- ? ) was born in 1855 in Wabash County, IN. She was a school teacher in Lancaster County, NE in 1880 when she was age 25 and unmarried. She is thought to have passed away on Feb. 8, 1932.

Daughter Calista Isabel Lehmer (1855- ? ) was born in 1855 in Wabash County, IN. She was a school teacher in Lancaster County, NE in 1880 when she was age 25 and unmarried. Research suggests she died on Sept. 5, 1926.

Daughter Josephine P. Lehmer (1859- ? ) was born in 1859 in Wabash County, IN. She was a school teacher in Lancaster County, NE in 1880 when she was age 21 and unmarried. She is believed to have perished on Sept. 4, 1919.

Son Henry Lehmer (1861- ? ) was born in July 1861 in Wabash County, IN. As a young man he was a farmer. He lived with his parents in 1900 at age 39 and labored as a stock feeder. His death may have occurred on May 29, 1945.

Son William "Willie" Lehmer (1863- ? ) was born in March 1863 in Wabash County, IN. He worked as a farmer as a teenager, and later was a stockman in Douglas County, NE. He married Emma Cora Smith (1867- ? ) and lived in Omaha, Douglas County, NE. They had three known children -- Lloyd H. Lehmer, John Lehmer and Olive Lehmer, all born in Nebraska. Death took place on Sept. 18, 1942.

Son Archie G. Lehmer (1865- ? ) was born in 1865 in Wabash County, IN. When he was age 15, he assisted his farming family with herding livestock and made his living for many years working with animals. In about 1895, at the age of 30, he married 19-year-old Daisie (1876- ? ), a native of Minnesota. They lived in South Omaha, Douglas County, NE, where he worked as a cattle feeder. He is thought to have died on Aug. 13, 1947.

Son Derrick Norman Lehmer (1867-1938) was born on July 27, 1867 in Somerset, Wabash County, IN. He married Clara Eunice Mitchell and they had five children -- Eunice Lehmer, Helen Lehmer, Derrick Henry Lehmer, Stephen Lehmer and Alice Lehmer. With bachelor's and master's degrees from the University of Nebraska, and a doctorate from the University of Chicago, Derrick was a mathematician and numbers theorist who taught at the University of California at Berkeley from 1900 to retirement in 1937. His specialty was the intricacies of prime numbers and prime factorizations and helped develop early computers, such as the Lehmer sieve, constructed with his son Derrick. He died in Berkeley on Sept. 8, 1938. [See Derrick Norman's Wikipedia entry.] 

  • Grandson Derrick Henry "Dick" Lehmer also was a numbers theorist, receiving a bachelor's degree in physics at Berkeley in 1927 and his doctorate in mathematics from Brown University (1930). He taught at the California Institute of Technology, the Institute for Advanced Study at Princeton University and Lehigh University. In 1940, he was named to the mathematics faculty at Berkeley, and was vice chair of the department of computer science, retiring in 1972. Among his accomplishments was work on Fermat's Last Theorem. Dick was the author of the book An Elementary Course in Synthetic Projective Geometry. He died on May 22, 1991 at the age of 86. In August 2000, Berkeley hosted The Lehmer Conference in tribute to the family and its contributions to the university. [See Dick's Wikipedia entry.]


~ Daughter Maria Catherine (Lehmer) Phillippi ~

Daughter Maria "Catharine" Lehmer (1829-1909) was born on April 25, 1829. 

She married Daniel Phillippi (1825-1886), son of John and Sarah (Weimer) Phillippi. 

Daniel succumbed at the age of 61 in 1886. 

Catherine survived him by 23 years. She spent the final part of her life in Casselman, Somerset County. Suffering from chronic inflammation of the bowels, added to exhaustion, she died on May 20, 1909 at the age of 80. Burial was in the Kingwood Church of God Cemetery. Mrs. H. VanSickle of Casselman signed the death certificate.


~ Daughter Rebecca Lehmer ~

Daughter Rebecca Lehmer ( ? - ? ) - nothing known.


~ Daughter Mary Ann Lehmer ~

Daughter Mary Ann Lehmer ( ? - ? ) - nothing known.



Copyright © 2014, 2022 Mark A. Miner

Research for this page graciously shared by the late Donna (Younkin) Logan