Medieval English families on the internet: I

Iggulden

• deYgolvyndenne, a.k.a The Most Mispelled Name In History (Wayne Iggulden)
  Miscellaneous information about the surname, including transcripts of 9 wills, 15th-17th centuries, from Biddenden, Kent

Inman

• Alfred H. Inman, A short account of the family of Inman of Nidderdale (1906) (Internet Archive - Text Archive)
  Pedigree with notes (Yorkshire, 16th century); an Appendix to Harry Speight, Nidderdale, from Nun Monkton to Whernside (1906)

Ismay

• Medieval Records (Dave Nixon, Ismay One Name Study)
  References from the patent rolls and other sources to ten 15th-century Ismays, most with maritime connections

Ivry

• Jean d'Ivri (Pat Patterson)
  Biography, from J.R.Planché's The Conqueror and His Companions (1874); to be used with caution, as indicated by the transcriber