Translated on behalf of id:aigm
While I hope Hatena allow us to use "Haiku", I’d line up some ideas if we cannot make it happen:

Name including Haiku:

re-Haiku (sounds "ri-ha-i-ku")

HaikuR (sounds "ha-i-ku-a-ru" or "ha-i-ka-ru"; means "Haiku Return")

Hicoo (looks different but sounds like Haiku)

Hikul (sounds "ha-i-lu-ru"; indicates "Do Haiku")

81go (sounds "ha-i-go"; a combination of phonetic replacement like 819 and "go" in English; has double meaning - "俳号" which means a "nom de plume" for haiku poets)

Names not including Haiku:

Oh!giree (sounds "o-gi-ri and indicates 大喜利; 大喜利 is a kind of wordplay by connecting image and/or sound around a keyword with joking or wit)

Honnect (sounds "o-ne-ku-to; a combination of "H"of Haiku and "connect")

side H (sounds "sa-i-do-H"サイドエイチ; it indicates that "in the Haiku side"; many hikers are using also other SNS, then, let’s say like "See you in the Haiku side!")

*Hi Sudo-san, please let me know if my explanation does’t make sense!