Jaani Seek (0) 
St-John’s Hospice/Almshouse (and later leprosarium), now best known for its church (Jaani seegi kirik, now the Armenian church of Grigor the Illuminator) on the corner of Tornimäe and Rävala and museum on Väike-Pääsukese. Known in Latin as domus fratrum leprosorum sancti Johannis, and in MLG as sankt Johannis sekenhus) from MLG sēk, sek, seek, seec, seeck, seik, zeyk, seck, sīk, and certainly others, related to Eng. ‘sick’. Why German switched to krank is anyone’s guess. First mentioned (1237) by Wilhelm / William of Sabina (and Modena), papal legate to popes Honorius III and Gregory IX, who tried to ensure Estonia belonged to Rome, and to whom Henry of Latvia, author of the Livonian Chronicle, was assigned as interpreter (1225-1227).
Kiek in de Kök (0)
Usually translated as “peep in the kitchen”, although ‘look’, cf. German gucken or kucken, might be more appropriate. Said to derive from Low Saxon kijk in de keuken. Earliest recorded spelling (1577) was Kyck in de Kaeken. Explanations revolve around its uncommon height of 38 m setting it so far above neighbouring houses’ chimneys that the guards could either see, at a stretch, straight down into the kitchens, or see what the enemy was cooking, their kitchens being furthest from the front. My personal suspicion, however, given later (and central to southern) German words such as Guckindiewelt (2nd half 18th C) and northern German variant Kiekindiewelt, curious child, Topfgucker, Nosy Parker, lit. saucepan peeker and, particularly, Guckfenster, Judas window, spyhole, peephole (recorded 16th C), of which the tower has many, is that the name means just a small kitchen- or observation-window and the tower was named by metonymy. See also Kuldjala torn.
Kangrupere (Kangrupere)
Kangru family or household. 2023 addition to Tallinn’s streets, but still to be built, named after former farm or manor house. Location (District & Sub-district) to be advised.