Loo (village)Loo is a village in Jõelähtme Parish, Harju County in northern Estonia.NameLoo was attested in historical sources as Loh Krog in 1689 and Loo körts in 1725, as Lo between 1810 and 1838, and as Loo in 1798, 1844, and 1871. The name is derived from the common noun loo 'alvar', referring to the thin soil and sparse vegetation in the area.