Doria

Possibly a feminine form of DORIAN or an elaboration of DORA.

DORIAN   male   English, French
The name was first used by Oscar Wilde in his novel 'The Picture of Dorian Gray' (1891), which tells the story of a man whose portrait ages while he stays young. Wilde may have taken it from the name of the ancient Greek tribe the Dorians, or from the surname DORAN.
DORAN     Irish
From Irish Ó Deoráin meaning "descendant of Deoradhán", where Deoradhán is a given name meaning "exile, wanderer".
DORA   female   English, Dutch, Spanish, Greek, Croatian, Serbian
Short form of DOROTHY, ISIDORA or THEODORA.
DOROTHY   female   English
Usual English form of DOROTHEA. It has been in use since the 16th century. The author L. Frank Baum used it for the central character in his fantasy novel 'The Wonderful Wizard of Oz' (1900).
DOROTHEA   female   German, Dutch, Danish, Norwegian, English, Late Greek
Feminine form of the Late Greek name Δωροθεος (Dorotheos), which meant "gift of God" from Greek δωρον (doron) "gift" and θεος (theos) "god". Dorothea was the name of two early saints, notably the 4th-century martyr Dorothea of Caesarea. It was also borne by the 14th-century Saint Dorothea of Montau, who was the patron saint of Prussia.
ISIDORA   female   Serbian, Macedonian, Spanish, Portuguese, Russian (Rare), Italian (Rare), English (Rare), Ancient Greek
Feminine form of ISIDORE. This was the name of a 4th-century Egyptian saint and hermitess.
ISIDORE   male   English, French, Georgian, Jewish
From the Greek name Ισιδωρος (Isidoros) which meant "gift of Isis", derived from the name of the Egyptian goddess ISIS combined with Greek δωρον (doron) "gift". Saint Isidore of Seville was a 6th-century archbishop, historian and theologian.

Though it has never been popular in the English-speaking world among Christians, it has historically been a common name for Jews, who have used it as an Americanized form of names such as Isaac, Israel and Isaiah.
ISIS   female   Egyptian Mythology (Hellenized)
Greek form of Egyptian Ist (reconstructed as Iset or Ueset), which possibly meant "the throne". In Egyptian mythology Isis was the goddess of the sky and nature, the wife of Osiris and the mother of Horus. She was originally depicted wearing a throne-shaped headdress, but in later times she was conflated with the goddess Hathor and depicted having the horns of a cow on her head. She was also worshipped by people outside of Egypt, such as the Greeks and Romans.
THEODORA   female   English, Greek, Ancient Greek
Feminine form of THEODORE. This name was common in the Byzantine Empire, being borne by several empresses including the influential wife of Justinian in the 6th century.
THEODORE   male   English
From the Greek name Θεοδωρος (Theodoros), which meant "gift of god" from Greek θεος (theos) "god" and δωρον (doron) "gift". This was the name of several saints, including Theodore of Amasea, a 4th-century Greek soldier; Theodore of Tarsus, a 7th-century archbishop of Canterbury; and Theodore the Studite, a 9th-century Byzantine monk. It was also borne by two popes.

This was a common name in classical Greece, and, due to both the saints who carried it and the favourable meaning, it came into general use in the Christian world, being especially popular among Eastern Christians. It was however rare in Britain before the 19th century. Famous bearers include three tsars of Russia (in the Russian form Fyodor) and American president Theodore Roosevelt (1858-1919).
OTHER FORMS
AMHARIC: Tewodros
ANCIENT GREEK: Doris, Isidora, Isidoros, Theodora, Theodoros, Theodorus
ARMENIAN: Toros
BULGARIAN: Teodor, Teodora, Todor, Todorka
CROATIAN: Dora, Dorijan, Doris, Dorotea, Doroteja, Tea, Teo, Teodor
CZECH: Dorota, Teodor, Theodor
DANISH: Ditte, Dorete, Dorit, Dorothea, Dorte, Dorthe, Ea, Tea, Teodor, Thea, Theodor
DUTCH: Dora, Dorothea, Theo, Theodoor, Theodorus
EGYPTIAN MYTHOLOGY: Isis
ENGLISH: Dee, Dodie, Dollie, Dolly, Dora, Dorean, Doreen, Doretta, Dorian, Dorinda, Dorine, Doris, Dorita, Dorothea, Dorothy, Dorris, Dortha, Dorthy, Dory, Dot, Dottie, Dotty, Isador, Isadora, Isadore, Isidora, Isidore, Issy, Izzy, Ted, Teddy, Thea, Theo, Theodora, Theodore
FINNISH: Dorotea, Tea, Teija, Teuvo, Tiia
FRENCH: Dorian, Doriane, Dorothée, Isidore, Theirn, Théo, Théodore
GEORGIAN: Isidore, Tedore
GERMAN: Doris, Dorothea, Isidor, Thea, Theda, Theodor
GREEK MYTHOLOGY: Doris
GREEK: Dora, Dorotheos, Theodora, Theodoros
HUNGARIAN: Dóra, Dorina, Dorka, Dorottya, Izidóra, Teodor, Teodóra, Tivadar, Tódor
ICELANDIC: Dóra, Theódóra
IRISH: Doran
ITALIAN: Doriano, Dorotea, Isidora, Isidoro, Teo, Teodora, Teodoro
JEWISH: Isidore
LATE GREEK: Dorothea, Dorotheos
LATE ROMAN: Dorotheus, Isidorus
LATVIAN: Teodors
LIMBURGISH: Thei
LITHUANIAN: Dorotėja, Urtė
LOW GERMAN: Dörthe
MACEDONIAN: Doroteja, Isidor, Isidora, Teodor, Teodora, Todor, Todorka, Toše, Toshe
NORWEGIAN: Dorothea, Ea, Tea, Teodor, Thea, Theodor
POLISH: Dorota, Dosia, Izydor, Teodor, Teodora
PORTUGUESE (BRAZILIAN): Dorotéia
PORTUGUESE: Doroteia, Isidora, Téo, Teodora, Teodoro
ROMANIAN: Dorin, Dorina, Teodor, Teodora, Theodor, Tudor
RUSSIAN: Dorofei, Dorofey, Fedor, Fedora, Fedya, Feodor, Feodora, Fyodor, Isidor, Isidora
SERBIAN: Dora, Doroteja, Isidora, Teodor, Teodora, Todor
SLOVAK: Dorota, Teodor
SLOVENE: Doroteja, Izidor, Tea, Teja, Teodor
SPANISH: Dora, Dorita, Dorotea, Isidora, Isidoro, Isidro, Teo, Teodora, Teodoro
SWEDISH: Dorotea, Ea, Tea, Teodor, Teodora, Thea, Theodor
UKRAINIAN: Fedir