For the twins, take both first names from the first set of names, and both middle names from the second set of names.
H:
Michael Christopher James John Daniel Joseph /
Anthony Timothy Charles Andrew JonathanW:
Jennifer Elizabeth Mary Sarah Susan Maria /
Heather Christina Kelly April Wendy
D/D: Allium
Amaryllis Anemone Arbutus Aster
Daffodil Larkspur
Lavender Nerine Orchid
Peony Tulip / Albania Armenia Bolivia Estonia Latvia
Liberia Macedonia Malaysia Romania Russia Syria Tunisia
S/S: Adams Buchanan
Cleveland Coolidge Fillmore
Ford Johnson
Monroe Polk
Roosevelt Taft
Washington / Chert Claystone Coal Gabbro Gossan Granite Greywacke Marble Marl Obsidian Shale Tuff
S/D: Aniston Arlington
Aston Brighton Darlington Elliston
Kynaston Lauriston
Patton Remington Seaton Sutton / Alder
Ash Briar Cedar Elm Hawthorn Hickory
Juniper Linden Oak
Rowan Spruce