Longan rhymes with:
mongan, clingan, dongen, dungan, erlangen, klingon, langan, mangan, mongan, mutlangen
Longan sounds like:
lamagna, lamison, lamkin, lamson, lanagan, lancome, lancon, langan, langen, langham, langman, langone, langsam, lanigan, laningham, lankan, lencioni, leninism, lenzen, lenzini, lewinsohn, limousine, lincecum, lincicome, linguine, linson, loewenson, lomasney, lonesome, longino, longman, luncheon