I have (finally) updated a page I made 1.5 years ago, containing for many languages the pages on the English Wikipedia that have many interwikis, but none to that specific language. The list can be found at [[meta:Common Interwiki links]]. I have shown those languages for which the number 100 in that list had less than 50 interwiki links.

Most Interwiki links in total had the page [[India]], a wopping 150. Also more than than 100 were in: [[True Jesus Church]] (132), [[Wikipedia]] (129), [[Kurów]] (114), [[United States]] (113), [[Europe]] (112), [[Bible]] (109), [[Lithuania]] (108), [[Germany]] (107), [[Russia]] (106), [[Christianity]] (104), [[English language]] (104), [[France]] (103), [[Geography]] (103) and [[Biology]] (101).

Here the language shown on the page, with for each language a few examples out of the highest pages on the list (that is, the pages with most interwiki links without one to that language):

ar: Haiti, Film and Vladimir Putin bg: German, Iran and Mahatma Gandhi ca: Ankara, Lion and James Joyce cs: Hindi, Welsh and Boston Massachusetts da: Japanese, Law and Virus de: Avian flu, Mohs scale and Yoghurt eo: Hard disk, Roman Catholic Church and the Pythagorean theorem es: North Africa, Abacus and Cooking et: Architecture, Antarctica and Spanish eu: Jesus, Japan and Computer fi: Tourism, Education and Mythology fr: Greek, Hobby and the Four color theorem gl: Jesus, Buddhism and Gold he: 1641, Villeneuve d'Ascq and Korean hr: Computer, Georgia (country) and Beijing hu: Algeria, Vladimir Putin and the days of the week id: Medicine, Buddhism and Dance it: Jakarta, Leif Ericson and Republic ja: 1685, Aragonese and Bihar ko: Dance, Marco Polo and Law lt: Katowice, China and Qur'an nl: Domestic pig, Sugar and Plasma nn: Biology, Mathematics and Plato no: Sea, Engineering and Sahara pl: B, Earth's atmosphere and Metaphysics pt: GNU, Atomic mass and Biotechnology ro: Bird, Politics and AIDS ru: Mahatma Gandhi, National anthem and Earth science simple: Jordan, Che Guevara and Marie Curie sk: Iceland, Moscow and Christmas sl: Geology, Angela Merkel and Los Angeles sr: Solar system, Operating system and Beijing sv: United Arab Emirates, Education and Alcohol th: Chess, Agriculture and many African countries tr: Thailand, Pope and Animal uk: Algeria, George W. Bush and Karl Marx zh: Money, Antonio Vivaldi and Aikido