Several family trees on Ancestry.com identify him with the Owen Adkins born about 1822 who married Fanny/Fannie Lewis on 20 April 1848, but I am very skeptical of that identification, since this Owen and Annie had a daughter Mary born about 1848 (age 2 in the 1850 census, and age 6 at her death in Oct 1854.) It is conceivable that Annie and Owen divorced when she was pregnant with Mary or when Mary was a newborn, and he immediately remarried to Fanny, but considering how many Adkins families there were in Morgan Co. in the 1840’s, and how often they used the same names (for example, there were three Wyatt Adkins age 21 to 25 in the county in the 1850 census), it seems far more likely that Annie and Fanny married two different Owen Adkins, and that Anna was widowed about 1849. Also, the Owen Adkins who married Fanny Lewis had a daughter Mary born about 1849, listed with them as age 1 in the 1850 census, and it seems very unlikely that someone would give two daughters in a row the same name when the first one was still alive, even if they were by different mothers.

Her marriage record to William lists her as “Mrs. Annie Adkins”.

For several years I had Wiliam McDaniel's wife entered as Anna Fannin who married Levi Adkins, because that was the only marriage of an Adkins groom to a bride named Anna or Annie in the 1840's on David May's transcription of Morgan County marriage records. But a more thorough search of the 1850 and 1860 Morgan Co censuses and vital statistic records reveal that Levi Adkins was still living in 1860 (and 1870) married to his second wife Pricey Ann Fultz, and that the children of Levi and his first wife Anna Fannin (who had apparently died by 1849) do not match the Adkins stepchildren living with William and Anna in 1860. Comparison of Morgan Co marriage records with death records, however, reveals that David May's transcription of the marriage records mistakenly lists Anny Wilbourn who married Owen Adkins as "Amy".

1850 census of Morgan Co., Ky, lists as family #706:
Anna Adkins, 26; Jasper, 6; Nancy, 5; Mary, 2. The place of birth column for Anna says Virginia, and there are dittos in that column for all the children, but they were probably really born in Kentucky.

Mary matches the age for Mary Adkins who died in 1854 at age 6, dau of Owen and Anna Adkins, and there is no Owen & Anna/Amy/Annie family in the 1850 census of Morgan Co., nor any births recorded for children of Owen and Anna in the 1850’s. (There is, however, a family of Owen Adkins age 27 with wife Fanny age 2 and daughter Mary age 1. I don’t know whether this is the same Owen Adkins who married Anna or a different one, but it is probably a different one; see Owen’s notes for further discussion.) And the ages for Jasper 6 and Nancy 5 match those for William J. Adkins age 17 and Nancy J. Adkins age 15 with the family of William & Anna McDaniel in 1860. So it is almost certain that the Anna Adkins in this census household was previously married to Owen Adkins, and that she is the Mrs. Annie Adkins who married William McDaniel in October 1850.

Online Morgan County marriage records as transcribed by David May list the marriage of Owen Adkins to Amy Wilbourn on April 28, 1842, by J. F. Wilbourn. But the death record of their daughter Mary lists them as Owen and Anna Adkins.