Same Name?!--John

What can you say about John? Thanks to a pair of admirable Bible characters, it's one of the most popular boys' names of all time, extremely common in all three major branches of Christianity (Eastern Orthodox, Roman Catholic, & Protestant). It didn't lose its hold in America until the 80s, and even then, it's still in the top 25. It's also one of the few traditional names with a comparable range of both male and female versions.
For some, John is a solid classic, for others, it's bland and tired.
And despite the similarity in English, it's actually unrelated to Jonathan.

Original Hebrew form: Yochanan [יוֹחָנָן] (yoh-kha-nahn)
Greek transliteration: Yoannes (yoh-AHN-nehs)
Latin form: Iohannes (yoh-AN-nes)

Modern versions:

• Evan (EV-an)--Welsh. Anglicized from Iefan. Other forms include Ifan (EE-van), Ieuan (YAY-an), Ioan (YOH-an), Iwan (EE-wan), and Sion (SHON [via Jehan]).
• Ganix (JAHN-eesh)--Basque
• Giovanni (joh-VAHN-nee)--Italian
• Hank (HANK)--Medieval English (via Hann)
• Hann (HAHN)--Medieval English (via Johannes). Diminutive is Hankin.
• Hans (HAHNS)--Dutch, German, Scandinavian (via Johannes)
• Honza (HON-zah)--Czech (via Hans)
• Ian (EE-an)--Scottish. Older form is Iain.
• Ion (YON)--Romanian
• Ivan (ee-VAHN or EYE-van)--Slavic
• Jack (JAK)--English (via Jankin) 
• Jan (YAHN, JAN)--Czech, Dutch, German, Medieval English. English diminutive is Jankin.
• Janez (YAHN-ez)--Slovene
• Jehan (zheh-han)--Medieval French
• Jens (YENS)--Dutch
• João (ZHOO-ow)--Portuguese
• Johan (YOH-han)--German, Scandinavian
• Johannes (yo-HAN-nes)--Late Latin
• Jovan (YOH-van)--Macedonian, Serbian
• Juan (HWAHN)--Spanish
• Keoni (keh-oh-nee)--Hawaiian
• Sean (SHAHN)--Irish. Sometimes anglicized to Shane.
• Xoan (SHOH-awn)--Galician
• Yann (YAHN)--Breton. Diminutive is Yannick.

Feminine forms:

• Gianna (JAHN-nah)--Italian
• Ioanna (yoh-AHN-nah)--Greek
• Ionela (yoh-NEL-lah)--Romanian
• Ivana (ee-VAH-nah)--Slavic
• Jana (YAH-nah)--Dutch, German
• Jane (JAYN)--English (via Jehanne). Diminutives are Janet, Janice, and Jenny.
• Janneke (YAH-neh-keh)--Dutch
• Jean (JEEN)--English, Scottish (via Jehanne). Scottish diminutive is Jessie.
• Jeanne (ZHAHN)--French (via Jehanne). Diminutives are Jeannine and Jeannette.
• Jehanne (zheh-hahn)--Medieval French
• Joan (JONE)--English (via Johanne)
• Joana (zhoo-AH-nah)--Portuguese
• Joanna (joh-AN-nah)--English
• Johanne (zhoh-ahn)--Medieval French
• Jovana (yoh-VAH-nah)--Macedonion, Serbian
• Seona (SHOH-nah)--Scottish (via Joan)
• Sheena (SHEE-nah)--Scottish (via Jeanne)
• Sian (SHAHN)--Welsh
• Siobhan (shi-VAWN)--Irish (via Jehanne). Anglicized to Shevon or Chevonne.
• Zana (ZHAH-nah)--Slovene