| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 301 | Iachimo | Shakespearean | 'Cymbeline' An Italian friend to Philario. | M | |
| 302 | Iago | Shakespearean | 'The Tragedy of Othello, Moor of Venice' Ensign to Othello. | M | |
| 303 | Iden | Shakespearean | 'Henry VI, Part 2' Alexander Iden, a Kentish gentleman. | M | |
| 304 | Illyria | Shakespearean | 'Twelfth Night', also called 'What You Will' Orsino, Duke of Illyria. | M | |
| 305 | Imogen | Shakespearean | 'Cymbeline' Daughter to Cymbeline by a former queen. | F | |
| 306 | Iras | Shakespearean | Antony and Cleopatra'. Lady attending on Cleopatra. | F | |
| 307 | Iris | Shakespearean | 'The Tempest' A spirit, rainbow goddess of Greek mythology. | F | |
| 308 | Isabel | Shakespearean | 'King Henry V' Queen of France. | F | |
| 309 | Isabella | Shakespearean | 'Measure for Measure' Sister to Claudio. | F | |
| 310 | Jack | Shakespearean | 'Henry VI, Part 2' Jack Cade, a rebel. | M | |
| 311 | James | Shakespearean | 'King John' James Jurney, servant to Lady Faulconbridge. 'King Richard III' Sir James Tyrrel. 'King Richard III' Sir James Blount. | M | |
| 312 | Jamy | Shakespearean | 'King Henry V' Officer in the King's army. | M | |
| 313 | Jaquenetta | Shakespearean | 'Love's Labours Lost' A country wench. | F | |
| 314 | Jaques | Shakespearean | As You Like It' Lord attending on the banished Duke. As You Like It' Son of Sir Rowland de Boys. Orlando | M | |
| 315 | Jessica | Shakespearean | 'The Merchant of Venice' Daughter to Shylock. | F | |
| 316 | Joan | Shakespearean | 'Henry VI, Part 1' Joan La Pucelle, commonly called Joan of Arc. | F | |
| 317 | John | Shakespearean | 'Henry IV' Prince. 'Henry VI' John Talbot. 'King Henry VI, III' John Mortimer, Montgomery, & Somerville. 'King John'. 'Merry Wives of Windsor' John Falstaff. 'Much Ado About Nothing' Don John. 'Richard II' John of Gaunt. 'Romeo And Juliet' Friar. | M | |
| 318 | Jourdain | Shakespearean | 'Henry VI, Part 2' Margery Jourdain, a witch. | F | |
| 319 | Julia | Shakespearean | 'Two Gentlemen of Verona' A lady of Verona, beloved of Proteus. | F | |
| 320 | Juliet | Shakespearean | 'Measure for Measure' Beloved of Claudio. 'The Tragedy of Romeo And Juliet' Daughter to Capulet, who falls in love with Romeo, son to Montague. | F | |