Heir
Heiress, Successor
noun
あとつぎ
遺産 (いさん) Inheritance, Heritage
継承 (けいしょう) Succession, Inheritance
跡継ぎ (あとつぎ) Heir, Heiress, Successor
足跡 (あしあと) Footprint
跡 (あと) Traces, Mark
継ぐ (つぐ) To Inherit
Heirs 跡継ぎ are the traces 跡 (people) that came after 後 あと you and are next 次 つぎ in line to inherit 継ぎ from you.