is this the one?

Warnakulasuriya Patabendige Ushantha Joseph Chaminda Vaas

The award for the longest name for a person belongs to a German immigrant to Philadelphia, Pennsylvania. The name he was given at birth, and which somehow fit on his passport was:

(First and "middle" names)
Adolph Blaine Charles David Earl Frederick Gerald Hubert
Irvim John Kenneth Loyd Martin Nero Oliver Paul Quincy
Randolph Sherman Thomas Uncas Victor Willian Xerxes Yancy
Zeus

(Last name)
Wolfeschlegelsteinhausenbergerdorffvoralternwarengewissenhaf
tschaferswesenchafewarenwholgepflegeundsorgfaltigkeitbeschut
zenvonangereifenduchihrraubgiriigfeindewelchevorralternzwolf
tausendjahresvorandieerscheinenbanderersteerdeemmeshedrraums
chiffgebrauchlichtalsseinursprungvonkraftgestartseinlangefah
rthinzwischensternartigraumaufdersuchenachdiesternwelshegeha
btbewohnbarplanetenkreisedrehensichundwohinderneurassevanver
standigmenshlichkeittkonntevortpflanzenundsicherfreunanleben
slamdlichfreudeundruhemitnichteinfurchtvorangreifenvonandere
rintlligentgeschopfsvonhinzwischensternartigraum

Senior

In case you didn't notice, he has one given name for every letter of the alphabet plus his surname. Needless to say, he shortened it, and was commonly known as Mr. Hubert Wolfe, though officially it was said that he signed his name Hubert Blaine Wolfeschlegelsteinhausenbergerdorff, Sr.

GOD BLESS HIM

Naam ma k chha sathi haru. Record todne nai ho bhane pachhai aafno bachha bachhi ko naam 4 pages rakhe bhai halyo ni.

The person(s) is stupid who granted him/her 'longest name' title. If my son (future) gets 2-3 hundred thousand dollars for having longest name in the Guinness World Record, I would make his name longest, just doing copy and paste, and later change his name to ‘Ram Prasad Sharma’ on Social Security Card.