This profile regards the Jewish community in what is now Leliūnai, Lithuania. There is a paragraph on JewishGen here, which I summarize below. There it is suggested that the Yiddish name is Lelyun. I have also seen its Yiddish name transliterated as Lilun and Lelion.

It is 8km southwest of Utena. In 1897 it had 305 residents, of which 140 were Jewish. In 1915, at the beginning of WW1, the Jewish population was expelled to the interior of Russia. (I do not think the same is true for the nearby population in Utena.) In 1923, the Lithuanian government counted 353 residents, of which 63 were Jewish. It had a Cheder (a Jewish elementary school), but some children studied in Utena. The Jews of Leliunai buried their dead in Utena.

Other References

It is included in the Yiddish language book Yidishe Shtet, shtethlekh un dorfishe yishuvim in Lite: biz 1918: historish-biografishe skitses edited by Berl Kagan.

Regarding shtetls in general, see the Yivo Encyclopedia entry here. Perhaps Lelyun is small enough that instead of a shtetl it is a shtetele, dorf or yishev?