Beijing has three dotted letters in a row (in lower case). Other words with multiple dotted letters are remijia, bogijiab, pirijiri, kharijite (which are all in W2), gaijin (in OSPD3), Fiji, Hajji, hijinks, Ujiji (where Stanley found Livingstone in 1871), Ajijic and Pijijiapan (cities in Mexico) jinjili (an alternative name for "sesame seed"), ijijimò (Nauruan for the adjective "lean," and Nauruan is a palindrome!), Shijiazhuang (Chinese city).
Niijima and Iijima are Japanese last names; Minoru Niijima is the artist who drew the cover graphic for Edward R. Tufte's book The Visual Display of Quantitative Information [Steve Lawson].
In Dutch, there are jij (you), pijjekker (pea-jacket, although not found in dictionaries), schrooiijzer (upstanding cutting iron for bars, rods), sjiiet (follower of the Shia), snijijzer (cutting iron), uitdijing (expansion), and zijig (effeminate) [Oscar van Vlijmen, René Davids].
In Lithuanian, jiji is an archaic Lithuanian form of "him" consisting exclusively of dotted letters, and kraujijimas is archaic for "staining with blood" [Juozas Rimas].
In Swahili, jiji means "city" and kijiji means a small city or village [Gerald Gathuto].
In Hungarian, jöjjön (meaning "he should come") has seven dots in a row [Maryam Frazer].