yes, but it is also quite possible that irish lads that did the same thing were also called "genti". as far as i know there are few ways of telling exactly who was part of the group that undertook the raiding, unless hinted strongly at.
for the most part history around this time is very hazy - what is recorded in the annals can be cross referenced to get a clearer picture.
anyway, as far as i gather, vikings were called "genti" due to their raiding on church sites. and its not impossible to assume this as the first major references in annals refer to "genti" attacking churhc sites, and these co-incide with the arrival and subsequent raids by vikings in ireland. i refer you to the Annals of Ulster entry for the year 795 AD where most translations read "Burning of Rechriu by heathens, and Scí laid to waste". the irish reads : "Loscadh Rechrainne o geinntib & Sci do choscradh & do lomradh."
"geinntib" here is the dative plural of "gentid(e)". this is only one example, there are many more.
is this event in irish history not accepted by most as THE initial viking attack in ireland, and they recorded down here as heathens? according to the dictionary of the irish language as wel, heathen is trasnlated as "gentide". so it can be taken that the irish called the vikings "genti"
now it may not be entirely accurate, but very little is 100% pure accurate.
but keep in mind that "genti" can also be translated as "pagan" - but if you were a devout christain, would you not call a non-believer who does sacrilidge to your god a heathen? most definitely.
