Some very interesting info on www.irishgenealogy.ie
re SEGRAVE, SEGRIVE, SEGREVE, SERGAVE, SEGROVE, SEDRIVE,SEGRIFF, SEGRIF names in the 1700s in Dublin. For instance:
Marriage at RC Parish of St. Michan, 8 March 1736:
Mr. O Neil Segrave & Miss Clare Ambrose
Witness 1: Mr. Segrave
Witness 2: Mrs N/R
Witness 3: Mr. Usher
Witness 4: Mrs. Usher
Marriage of James Archbold to Eliz Lattin 11 Feb 1747 at St. Michans
Witness 3: Neille Seagreve
baptism of Henry John Segrave at RC Church of SS Peter & Paul, Cork, Ireland on 5 Nov 1792
Father: O'Neal Segrave
Mother: Margaret Goold
burial of O Neal Segrave of Cabra, 25 Aug 1793, St. James COI.
You can check out the hundreds of others at irishgenealogy.ie site.