Etymology
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Words related to soliloquy

sole (adj.)
"single, alone, having no husband or wife; one and only, singular, unique," late 14c., from Old French soul "only, alone, just," from Latin solus "alone, only, single, sole; forsaken; extraordinary," of unknown origin, perhaps related to se "oneself," from PIE reflexive root *swo- (see so).
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*tolkw- 
Proto-Indo-European root meaning "to speak."

It forms all or part of: circumlocution; colloquium; colloquy; elocution; eloquence; grandiloquence; interlocution; interlocutor; locution; locutory; loquacious; loquacity; loquitur; magniloquence; magniloquent; obloquy; soliloquy; somniloquy; vaniloquence; ventriloquism; ventriloquy.

It is the hypothetical source of/evidence for its existence is provided by: Latin loqui "to speak;" Old Irish ad-tluch- "to thank," to-tluch- "to ask;" Old Church Slavonic tloko "interpretation, explanation."
monologue (n.)

1660s, "long speech by one person, scene in a drama in which a person speaks by himself," from French monologue, from Late Greek monologos "speaking alone or to oneself," from Greek monos "single, alone" (from PIE root *men- (4) "small, isolated") + logos "speech, word," from legein "to speak," from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')." Related: Monologist.

soliloquize (v.)
1759, from soliloquy + -ize. Related: Soliloquized; soliloquizing.