系列【けいれつ】
series, sequence, system, succession, keiretsu (group), conglomeration of businesses linked by cross-shareholdings, affiliated, subsidiary
日系【にっけい】
(of) Japanese descent, non-Japanese of Japanese descent, nikkeijin, company, etc. set up with Japanese capital, company managed by Japanese or non-Japanese of Japanese descent
体系【たいけい】
system, organization, organisation, architecture
系統【けいとう】
system, lineage, ancestry, family line, group (e.g. of colors) (colours), family (e.g. of languages), party, school (of thought), close (evolutionary) relationship, a population sharing a common ancestor (in genetics), strain (e.g. bacterial)
直系【ちょっけい】
direct descent, direct line
家系【かけい】
family lineage
系譜【けいふ】
genealogy, lineage, family tree, pedigree
系図【けいず】
family tree, pedigree, genealogy