leo = with-them. It can also mean 'slush, slime'.
Roughly 'ahead with them'
Do you mean Leo the star sign? If so, it represents a lion and Leo is the Latin for lion.
'Will' is not an Irish word and has no meaning in Irish.
It doesn't mean anything in Irish.
Patrick Leo Henry has written: 'An Anglo-Irish dialect of North Roscommon' -- subject(s): Dialects, English language
Nikko doesn't mean anything in Irish.
It doesn't mean anything in Irish.
Leo or Lev means lion in Russian.
If you mean the Irish (Gaelic) it is not in that language. Irish has neither 'k' nor 'y' in its alphabet.
Does Ballavue mean anything in Irish? I can find no example of it as a placename. 'Vue' is not a word in Irish.
"eme" doesn't mean anything in Irish. It doesn't look like an Irish word.
"Isabelle" doesn't mean anything in Irish, but the Irish version of the name is Sibéal (shibael).
It doesn't mean anything in Irish: it's not an Irish name. I believe it's French.