A verb appearing in its 1st-singular form ᴱQ. iqin in the Qenya Lexicon of the 1910s glossed “I beg, ‘pray’”, derived the early root ᴱ√IQI “request, ask for” (QL/43). Tolkien specified it was used “only in this form” [1st-singular]. I suspect that the gloss ‘pray’ is in its archaic English sense “ask earnestly”.

Neo-Quenya: I would retain this as a general verb ᴺQ. iqu- “beg, ‘pray’ [ask earnestly]”, based on the Neo-Root ᴺ√IKWI(S). Helge Fauskanger used this verb for “to beg” in his Neo-Quenya New Testament (NQNT). For “pray [to God]” Fauskanger instead used hyam-, and I would do the same for purposes of Neo-Quenya.