« Reply #1 on: Friday 13 January 12 21:12 GMT (UK) »
A middle surname was often a maternal grandmother's maiden name. Other reasons for a surprise introduction of a middle surname is of some sort of benefactor, e.g. the name of a nurse/doctor who delivered a child, or a benefactor who gave a father a job or lent money.
I see from your other postings that your ancestors were mariners - and it may be that "Emily Baring" was the name of a first ship, or a Mr Baring gave the ancestor his first captaincy.
It's often helpful to search for surnames in the a2a manorial catalogue - the results can give an idea of the counties the names are common in and quite often an ancestral link can be revealed (I see there's many results for Dumble and Baring and also a will for an Emily Baring).
http://www.nationalarchives.gov.uk/a2a/This could be a red herring but there's a "Baring Archive" pertaining to shipping - and each shipping line had agents in most ports - maybe there's a link.
http://www.baringarchive.org.uk/materials/the_baring_archive_hc6.pdf
Aberdeen: Findlay-Shirras,McCarthy: MidLothian: Mason,Telford,Darling,Cruikshanks,Bennett,Sime, Bell: Lanarks:Crum, Brown, MacKenzie,Cameron, Glen, Millar; Ross: Urray:Mackenzie: Moray: Findlay; Marshall/Marischell: Perthshire: Brown Ferguson: Wales: McCarthy, Thomas: England: Almond, Askin, Dodson, Well(es). Harrison, Maw, McCarthy, Munford, Pye, Shearing, Smith, Smythe, Speight, Strike, Wallis/Wallace, Ward, Wells;Germany: Flamme,Ehlers, Bielstein, Germer, Mohlm, Reupke