Here is one occurance of bUchularEDu for Siv:
... chUchi namaskarinchi sruti sUktula sannutiseyuvAnitO
bUchularEDu paLKE... Attaluri Papakavi, Chennabasavapurnamu. 4. 13
(nineteenth century).
for bUchi..
alarubrAyapugannula
kalikiki mudimagadu bUchi gAvuna...
Baicharaju VenkatanathuDu, Panchatantramu 3.180 (Circa 1550)
Both refrences from SUryarAyndhra Nighantuvu.1982.