Could Harry have other relatives?

[fawkes970]

No: HPFGUIDX 78661

In the fifth book, There is a simple clue leading me to suspect that 
Harry may well have relatives from Lily's side. In the fifth book, 
Chapter 1:Dudley Demented; Harry meets up with Dudley during the 
night and during their talk he says to Dudley, "'So who've you been 
beating up tonight?' Harry asked, his grin fading. 'Another ten-year 
old? I know you did Mark Evans two nights ago --'" - As we all know 
well by now, JK is not one to throw words around. What with Mrs Figg 
in the end of the fourth leading to her true identity in the fifth. 
The last name Evans I am of course referring to Lily. JK could have 
chosen any name , but none the less she uses the maiden name of 
Lily, Harry's mother. Any thoughts on this one? ~Pat