Shikanaru is an abbreviated form of ShikamaruxNaruto, fom the manga/animeNaruto, were Shikamaru and Naruto are in a romantic relationship and Shikamaru is seme while Naruto is uke.
Shikaar is the name of a awesome hindi boy, who laughs at everything and doesn't give a shit about anything. But he is a lover not a fighter. Who tends to have a identity crisis;)