What does "elzevir" mean?

Elzevir: Applied to books or editions (esp. of the Greek New Testament and the classics) printed and published by the Elzevir family at Amsterdam, Leyden, etc., from about 1592 to 1680; also, applied to a round open type introduced by them. The Elzevir editions are valued for their neatness, and the elegant small types used. Brande & C. 'EM 'Em. An obsolete or colloquial contraction of the old form hem, them. Addison.