Somerville, who played 66 Tests for New Zealand, joined Gloucester last Autumn and went on to make 13 appearances for the Cherry and Whites.
He will be joined in the squad by departing Gloucester wing, Iain Balshaw, who will join Biarritz in the summer.
Barbarians and Cardiff Blues Coach Dai Young said:
"I'm delighted with the squad that's been selected and I'm looking forward to working with them and London Irish Assistant Coach Mike Catt when we meet up on May 26."
"The squad is full of quality players, including a number of RWC, Tri-Nations and Grand Slam winners and I'm expecting them to give a very good account of themselves when they play England and Australia."
England Team Manager Martin Johnson said:
"The Barbarians squad that's been announced today is full of international experience and they will provide England with a very tough game on May 30 before we go onto play Argentina in a two test series."
"The Barbarians match is one we're all looking forward to and I will be announcing a strong England squad on May 19 for all three games."
The Barbarians Captain will be named once the squad meet up on May 26.
Tickets for the England v Barbarians match on Saturday May 30 (kick off 4.15pm) are priced from £25 for adults and £10 for U16s and are available now by calling ticketmaster on 0844 847 2492 or www.ticketmaster.co.uk.
BARBARIANS SQUAD
BACKS
Iain Balshaw (Gloucester Rugby and England)
Ben Blair (Cardiff Blues & New Zealand)
Gordon D'Arcy (Leinster and Ireland)
Peter Grant (Stormers and South Africa)
Doug Howlett (Munster & New Zealand)
Josh Lewsey (London Wasps and England)
Seilala Mapusua (London Irish & Samoa)
Justin Marshall (Saracens and New Zealand)
Luke McAllister (Sale Sharks and New Zealand)
Geordan Murphy (Leicester Tigers & Ireland)
Sonny Bill Williams (Toulon)
Dimitri Yachvilli (Biarritz Olympique & France)
FORWARDS
Serge Betsen (London Wasps & France)
B J Botha (Ulster & South Africa)
Schalk Brits (Stormers and South Africa)
Sebastien Bruno (Sale Sharks & France)
Jerry Collins (Toulon & New Zealand)
Martin Corry (Leicester Tigers & England)
Rocky Elsom (Leinster & Australia)
Justin Harrison (Bath Rugby & Australia)
Chris Jack (Saracens & New Zealand)
Greg Somerville (Gloucester Rugby & New Zealand)
Iestyn Thomas (Scarlets & Wales)
Paul Tito (Cardiff Blues)
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