Oikea means right, as in “right hand” (=oikea käsi). This word has other meanings both in English and Finnish, for example Sinä olet oikeassa. = “You are right”. (literally. “in right”).
Right as in “right to do something” is oikeus in Finnish.
Finland has a concept called “jokamiehen oikeus” ~ “Everyman’s right”. It means, that you can go freely in the forests and nature, as long as you don’t disturb people or damage property.
In politics, the right wing is oikeisto in Finnish.