Fence, enclosure, garden, run. However, as in English where ‘garden’ originally meant that which enclosed it, as in, for example, Latin: hortus gardinus, ‘enclosed garden’, deriving from Proto Indo-European (PIE) *gher- ‘to grasp, to enclose’ (cf. Old English geard ‘enclosure, garden, house’, etc.) ultimately giving rise to Old Church Slavonic gradu1, ‘town, city’ and Russian город (gorod), град (-grad), English girdle and related to PIE *gherdh- ‘staff, pole’. The same seems to apply in Estonian where the aed originally meant an enclosure made of pickets (cf. Finnish aita, fence). Only Tallinn street name a palindrome in the genitive, but not the nominative. Rare in existing in 3 varieties. For details, see, in reverse alphabetical order: Aia [tänav], Aia [tee] and Aia [käik].
1) Given the complications of displaying ‘exotic’ scripts online, see, and ideally buy, A Rambling Dictionary of Tallinn Street Names (all author ‘profits’ go to the Tallinna Lastehaigla Toetusfond (Tallinn Children’s Hospital Foundation, set up to aid purchase medical equipment), allowing you to contemplate, with wonder I hope, one of humanity's multiple endeavors at reproducing the infinite subtleties of speech in a pathetic 20-odd alphabet.
Confusion in the Danish House of Knut (Canute). Canute’s Guild, Kanuti Gild, was a Hanseatic merchant guild involving the more complex crafts: mainly goldsmiths, watchmakers, milliners, but also bakers, shoemakers and painters. First recorded 1326, probably founded 13th C, disbanded 1920. Name comes from Knut Lavard (1090ish-1131), Duke of Schleswig and sovereign over the Western Wends, canonized 1171, feast day January 7, the day on which he was assassinated. Knut Lavard was nephew of Knut IV (1043ish-1086), aka Canute the Saint / the Holy, great-nephew of Knut the Great (985ish-1035). Knut IV’s official Catholic feast-day is January 19, but celebrated on January 13 in Estonia, Sweden and Finland, apparently for his decreeing that Christmas last 20 days. Since both were saints, both were nephews of a King Knud, both had feast days in January, confusion seems inevitable. Some of the more fervent Estonians still celebrate Canute’s day, Nuudipäev, (any date ranging from January 13 to January 7) by drinking. Both street and park/garden (Kanuti Aed).