The word Easter appears one time in the Bible (KJV). This word should not be in the Bible (KJV). It is a mistranslation. It should have been translated Passover instead of Easter.
The Strong’s number for Passover is #G3957 and it appears 28 times in the New Testament. Every time Strong’s number #G3957 is used, it is translated as Passover, except one time. That one exception is found in Act. 12:4, when it is translated Easter. Perhaps the translator was a little bias. The one time that Strong’s #G3957 is translated as Easter; it is upper case. The other 27 times when it is translated as Passover, it is always lower-case, except one time (Luk. 22:1).
Note the following verses and pay special attention to the text that’s highlighted in red.
Act. 12:4 And G2532 when he( G3739 ) had apprehended G4084 him, he put G5087 him in G1519 prison, G5438 and delivered G3860 him to four G5064 quaternions G5069 of soldiers G4757 to keep G5442 him; G846 intending G1014 after G3326 Easter G3957 to bring him forth G321 G846 to the G3588 people. G2992
1Co. 5:7 Purge out G1571 therefore G3767 the G3588 old G3820 leaven, G2219 that G2443 ye may be G5600 a new G3501 lump, G5445 as G2531 ye are G2075 unleavened. G106 For G1063 even G2532 Christ G5547 our G2257 passover( G3957 ) is sacrificed G2380 for G5228 us: G2257
Heb. 11:28 Through faith G4102 he kept G4160 the G3588 passover, G3957 and G2532 the G3588 sprinkling G4378 of blood, G129 lest G3363 he that destroyed G3645 the G3588 firstborn G4416 should touch G2345 them. G846