local function orEquals(tofind,...)
    for _,v in ipairs{...} do
        if v == tofind then return true end
    end
    return false
end

-- usage
local digit = "one"
print( orEquals(digit,"two","three","one") ) -- true
digit = 4
print( orEquals(digit,2,3,1) ) -- false

local Name = "Marina"
if string.find("Marina, Lena, Igor, Sveta, Dima", Name) then
    print(Name)
end

Name = 'Marina'
if Name == "Marina" or Name == "Lena" or Name == "Igor" or Name == "Sveta" or Name == "Dima" then
    print(Name)
end

if Name == "Marina" or "Lena" or "Igor" or "Sveta" or "Dima" then
    print(Name)
end