Jessica ("The Lost Hornpipe of the Pirate Captain"): +1
Jessica ("The Lost Log Books of Magellan"): -1
Same name, but one far outclasses the other.

Season 1:
Jennifer Holtz (Galileo's Cannonball) 9
Jennifer (John Sutter and the Map to the Lost Gold Mine) 13
Becca (The Helmet of Genghis Khan) 6
Tina (The Pendant of Kamehameha) 9
Lea (The Star of Sultan Saladin) 9
Lucretia (The Trojan Horseshoe) 5
Shay (Henry the Eighth's Great Seal) 5
Jessica (The Lost Log Books of Magellan) 3
Kristin (The Lucky Pig of Amelia Earhart) 5
Jessica Hill (Ponce de Le?n and the Lost Fountain of Youth) 5
Catherine (The Golden Cup of Belshazzar) 4
Katie (The Paintbrush of Leonardo da Vinci) 5
Jennifer (The Belly Button of Buddha) 7
Jennifer (The Golden Chains of Zenobia) 5
Mandy (The Helmet of Joan of Arc) 5
Christina (The Stolen Arm of Shiva) 5
Keeley (The Stone Marker of Leifr Eir?ksson) 5
Tracy (The Golden Jaguar of Atahualpa) 5
Retina (Alexander and the Gordian Knot) 5
Tara (The Medal of Sir Edmund Hillary) 5
Vicki (The Silver Saddle Horn of Hannibal) 5
Eusinia (King Tut's Cobra Staff) 6
Colleen (Pecos Bill's Lost Lariat) 5
Erica (Robin Hood and Marian's Ladder) 6
Jennifer (The Dragon Lady and the Blue Pearl) 8
Rinette (The Codebook of Mata Hari) 5
Candace (Lawrence of Arabia's Headdress) 8
Shannon (The Collar of Davy Crockett) 8
Tracy (The Snake Bracelet of Cleopatra) 8
Katherine "Fred" (The Treasure of Anne Bonny) 7
Season 2:
Kendra (The Golden Stallion of Ali Baba) 5
Paula (The Silver Horseshoe of Butch Cassidy) 7
Olivia-Emma (The Applewood Amulet of Emiliano Zapata) 10
Leah (The Bone Necklace of the Blackfeet Chief) 3
Tabitha (The Diary of Dr. Livingstone) 5
Michelle (The Electrified Key of Benjamin Franklin) 6
Ashley (The Imperial Purple Robe of Empress Theodora) 4
Whitney (The Lost Love Letter of Captain John Smith) 5
Missy (The Lucky Pillow of Annie Taylor) 11
Angela (The Mush Pot Hat of Johnny Appleseed) 5
Heather (The Stone Head of the Evil King) 2
Renee (The Crown of Queen Nzinga) 5
Monica (The Ivory Elephant of Scheherazade) 5
Kelly (The Jeweled Necklace of Montezuma) 5
Marie (The Lost Lion Tail of Little John) 3
Danielle (The Mask of the Man in the Iron Mask) 5
Emily (The Missing Eye of David) 5
Jessica (The Plumed Headdress of Cosa Rara) 5
Gracelyn (The Sacred Ring of Sultan Suleiman) 4
Jenelle (The Shriveled Hand of Efoua) 5
Carly (The Two-Cornered Hat of Napol?on) 7
Rachelle "Shelly" (The Golden Goblet of Attila the Hun) 5
Chandra (The Leopard-Skin Cloak of Annie Oakley) 5
Jessie (The Silk Sash of M?l?n) 5
Kelley (The Snakeskin Boots of Billy the Kid) 7
Ashlie (The Bonnet of Dolley Madison) 5
Ashley (The Golden Earring of Henry Morgan) 5
Elizabeth Humphries (The Levitating Dog Leash of Nostradamus) 8
Tarrah (The Milk Bucket of Freyd?s) 10
Kim (The Missing Weather Maps of Charles Lindbergh) 5
Kristen (The Priceless Portrait of the Polynesian Girl) 7
Cristina (The Secret Battle Plan of Nathan Hale) 4
Season 3:
Irish (The Bent Shaving Pan of Jedediah Smith) 6
Kimberly (The Broken Trident of Poseidon) 4
Leah (The Bullet-Riddled Handbag of Belle Boyd) 6
Olivia (The Comet-Embroidered Battle Flag of William the Conqueror) 5
Elisa (The Discarded Seal of Ivan the Terrible) 8
Tess (The Dried Ear of Corn of Sojourner Truth) 5
Christine (The Golden Spider Web of Robert the Bruce) 5
Janeen (The Good-Luck Watch of Empress Eug?nie) 2
Yakerra (The Ivory Hunting Horn of Roland) 11
Kristin (The Jewel-Encrusted Egg of Catherine the Great) 11
Lacey (The Jeweled Scabbard of Sforza) 7
Katie (The Lily-Crested Crown of Clovis the First) 3
Andrea (The Lion-Headed Bracelet of Chadragupta) 8
Lauren (The Lion-Slashed Jacket of Sacagawea) 5
Jessica (The Lost Hornpipe of the Pirate Captain) 11
Chrystine (The Lost Taj Mahal Turban of Aurangzeb) 5
Brittany (The Lost Whale Bone of Pytheas) 5
Noelle (The Marble Armrest of Xerxes) 4
Randy (The Metal Beard of the Egyptian Queen) 10
Rachel (The Missing Portrait of Hans Holbein) 5
Tiffani (The Much-Heralded Helmet of Sir Gawain) 9
Maggie (The Mummified Hand of the Egyptian King) 3
Amanda (The Mussel Shell Armor of Apanuugpak) 10
Kate (The Mysterious Manuscript of Mary Shelley) 5
Katie (The Mystical Spellbook of the Imperial Wizard) 5
Dawn (The Pearl Necklace of Gwalior) 5
Brandy (The Red Sash of Tokugawa Ieyasu) 5
Lissy (The Royal Torque of Queen Boadicea) 6
Annie (The Ruby Earring of bin-Zibab) 9
Miriam (The Secret Map of the Bandit Queen) 6
Heather Cuevas (The Snow Cone of Mount Kilimanjaro) 3
Sherra (The Upside-Down Compass of Henry Hudson) 5
Hallie (The Useless Map of the Chibcha Chieftain) 5
Elise (The War Fan of the 47 Ronin) 4