Welcome to Rootschat- you have posted in the right place.
Not researching Witherows but do have a bit of information on them.
Witherows in Cuilbane were same as Professor Witherow.
First Garvagh Presbyterian (old) burying-ground: Erected by John Witherow, of Coolbane. In loving memory of his sister Isabella, who died 10th August 1903, aged 72 years. The above John Witherow died 5th July 1905, aged 80 years.
Coleraine Chronicle, 8 July 1905: Death- WITHEROW- July 5, at Mettican, Garvagh, John Witherow, late of Culbane, Garvagh, aged 80 years.
John Witherow's nephew Joseph came to Cuilbane from Australia and is in
1911 census with wife and 2 sons.
Wife's death- Northern Constitution, 24 Feb.1917: Death- WITHEROW- At Western Infirmary, Glasgow, from shock, on the 13th inst., Annie Reid, the beloved wife of Joseph Witherow late of Cuilbane, Garvagh.
PRONI D2587/3A/10: 25 Dec.1898-4 Mar.1890 John Witherow of Coolbane, farmer, cousin of Pref. Witherow of Magee College. Nephew Joseph formerly Queensland came back to uncle's farm. Joseph's wife Annie, eldest son Alexander died young, sons George Reid and John Edward b.16 May 1898?.
St. Paul's Parish Church, Garvagh: To the memory of James Hughes depd this life 23rd Decb.1815 age 77. Anne Hughes Depd 13 Sept 1817 aged 76 of Garvagh. Mary Woodrow or H late of Coolbawnl. Depd this life 27th June 1836 aged 70 yrs. Here lieth remains of Robert Woodrow late of Coolbawn who departed this life 7th of June 1838 Aged 79 years.
There's more if you are interested.