No. Only families tha stay together and have traditions passed down are called clans. Not every family is a clan. Tell that to all those people who for some reason think that there is a Namikaze clan.
I Think there was a namikaze clan a long time ago but then they either got married outside the clan of they got killed....
OT: no we dont know if rock Lee or tenten has a clan.... But we haven't heard if they are in a clan but its very unlikely... Sakura doesn't have a clan either it seems