Leontarakis and Koutsonikolis

Hi, I am researching my grandfather, Demetrious Janos Koutsonikolis family line.  He was born near Ano Kastania in 1897 and came to American around the turn of the century. his mother was Helene Leontarakis.  does any of this relate to your line?  
We are planning a trip to Greece to do research in Sept and Oct. Thank you, 
Peggy Wilson