Etymology
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Words related to hello

hallo (interj.)
shout to call attention, 1781, earlier hollo, holla (also see hello). "Such forms, being mere syllables to call attention, are freely varied for sonorous effect" [Century Dictionary]. Old English had ea la. Halow as a shipman's cry to incite effort is from mid-15c.; Halloo as a verb, "to pursue with shouts, to shout in the chase," is from late 14c. Compare also harou, cry of distress, late 13c., from French.
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holla 
1580s as a command to get attention, in which use it belongs in the group with hello, hallo. From 1520s as a command to "stop, cease," from French holà (15c.), which "Century Dictionary" analyzes as ho! + la "there." As an urban slang form of holler (v.) "greet, shout out to," it was in use by 2003.
holler (v.)
1690s, American English, variant of hollo (1540s) "to shout," especially "to call to the hounds in hunting," which is related to hello. Compare colloquial yeller for yellow, etc. Related: Hollered; hollering.
hullabaloo (n.)
1762, hollo-ballo (with many variant spellings) "uproar, racket, noisy commotion," chiefly in northern England and Scottish, perhaps a rhyming reduplication of hollo (see hello). Bartlett ("Dictionary of Americanisms," 1848) has it as hellabaloo "riotous noise; confusion," and says it is provincial in England.
hullo 
call to attract attention, by 1828; see hello.