I'm just guessing that maybe you are referring to a male name Kaz, or Kazu, which is normally an abbreviated version (nickname) of longer names such as Kazuo, Kazuhiro, Kazuhiko, Kazutoshi, etc., etc., there are many male names that start with kazu-.
Definition of Quatrain. A quatrain is a verse with four lines, or even a full poem containing four lines, having an independent and separate theme. Often one line consists of alternating rhyme, existing in a variety of forms.
A couplet is a pair of rhymed lines of poetry. Such pairs can occur on their own, as short poems or aphorisms, or strung together as long poems or combined with other poetic forms, most commonly as the final lines of an English-style, or Shakespearean, sonnet.n elegiac couplets is an older form, favored by classical writers; it comprises one line of dactylic hexameter and one of pentameter, with a brief pause, or caesura, in the middle. In both cases, the couplets are closed, meaning that each pair of lines constitutes a single thought or complete sentence.