עלוקה Leech
Every verse in which this word stands — 1 place, in canonical order, first appearance to last. These are the places the lexicon carries under this word's own entry, counting every form the text writes it in, which is the number on the list.
Once, in Mishlei 30:15 — the alukah with her two daughters crying 'give, give.' The leech by the plain sense; the tradition also reads a figure, and the discussion is old.
לַֽעֲלוּקָה שְׁתֵּי בָנוֹת הַב הַב שָׁלוֹשׁ הֵנָּה לֹא תִשְׂבַּעְנָה אַרְבַּע לֹא־אָמְרוּ הֽוֹן
The horseleech hath two daughters: ‘Give, give.’ There are three things that are never satisfied, Yea, four that say not: ‘Enough’:
Quick answers
What is the Hebrew word for leech?
Leech in Hebrew is עלוקה, with a gematria of 211 in the standard method.
How many times is the leech mentioned in the Tanakh?
The word stands 1 time in the Tanakh, first at Proverbs 30:15.
A spelling is not a word. The corpus never writes עלוקה bare — every one of its places carries a particle or a suffix on the front or the back — so the spelling above is the word's own headword, and the verses listed here are the only door to it.