Waino is of Finnish origin and means 'little wave'. It is a unique, unisex name that was particularly popular during the late 19th to mid-20th century in Finland.
"The name Waino experienced a notable increase in popularity between 1915 and 1918, with a significant spike in births occurring during these years. However, the name's popularity declined considerably after 1920, with fewer than 20 births recorded each year from 1921 onwards, except for a brief uptick in 1924. Notably, there was a large gap of nearly three decades between 1930 and 1954 before another birth was recorded under this name."