Five Letter Boy Names

Borne by the esteemed Japanese architect Tadao Ando.

A masculine name in the Old Testament, but used contemporarily as a feminine name.

Hungarian diminutive of Sigmund

Ibsen is a literary hero name possibility, after the great Norwegian dramatist, Henrik I. The name Ib is a short form of Jacob, so you might consider Ibsen as an honorific for or a twin of a Jacob.