found at hindskw.com under genealogy and the surname index.it list hundreds of lowrance including yours below.

robert f. lowrance
born-1802 lincoln co.nc
died-
married-susannah hoke born 1800-
married-june 5,1823
children-
1.andrew a. lowrance
1828 north carolina-sept.1,1864 georgia
married-mary columbia turner on nov.29,1855
she was born-feb.18,1838 iredell co.nc
and died dec.22,1915 in wayne co.missouri

2.frederick sydney lowrance
born-1833
died-may 10,1889 tebo,tallamook co.oregon
married-april 3,1856 to artemissa prise
born-1838 roane co.tn
died-1873 kansas
children-
1.cordelia lowrance
2.frances ellan lowrance-
3.john robert lowrance-
4.bell lowrance-1866
5.columbia ann lowrance 1868-
6.florence olivia lowrance aug.19,1873 kansas-aug.16,1970

3.emeline l. lowrance 1837-

4. robert f. lowrance II 1842-

5.peter philo lowrance
born-1844 georgia
died-march 17,1880 marion co.arkansas
married-sarah elizabeth day on march 16,1870
born-may 29,1829 walker co.ga
died-1941 marion co.arkansas
children-
1.lewis robert lowrance - sept 9,1871
2.mary susan caroline lowrance - sept.13,1873